Internal slide firearm with modular chassis and control assemblies

Abstract

A firearm platform includes chassis system with a fixed barrel forming a structural bearing element, maintaining sight to bore alignment under dynamic load. An internal slide reciprocates coaxially within the chassis to reduce profile and signature, seal moving parts from debris, and permit direct mounting of muzzle devices without altering cycle timing. A selectable binary recoil assembly, actuated by an external charging handle, transitions between full power and low resistance states to ease manual charging while preserving firing performance. A toolless upper module houses breech and extraction components for rapid reconfiguration without optics disturbance. An integrated power bus distributes energy to accessory mounts, including a cartridge count display visible within a firing grip. Ambidextrous controls include a unified sear with safe de-cock and a firing pin block. The architecture supports modular upper and lower interchange, caliber changes, and integrated powered accessories.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0000] This application claims the benefit of U.S. Provisional Patent Application No. 63 / 686,704, filed Aug. 23, 2024, and U.S. Provisional Patent Application No. 63 / 843,001, filed Jul. 13, 2025, under 35 U.S.C. § 119(e). The entire disclosures of the foregoing applications are incorporated by reference herein.TECHNICAL FIELD

[0001] This disclosure relates to firearms and small-arms platforms, including systems and methods for their design, manufacture, and operation.DEFINITIONS

[0002] For the purposes of this disclosure, the following terms have the meanings indicated:

[0003] Internal Slide: A reciprocating member guided to move axially relative to the barrel. In these embodiments, the internal slide may be guided by a cylindrical bearing fit to the barrel (maintains co-axiality, suppresses pitch and yaw) and by an anti-rotation interface which may prevent roll while permitting axial reciprocation (e.g., inboard rails under a chord of the slide’s primary bore engaging complementary flats / tracks on a barrel monoblock). The internal slide may incorporate a substantially crescent shaped relief cut on the bottom portion of the breech side which is intended to provide an edge to cock the hammer during firing or charging intervals.

[0004] Primary Internal Slide Bore: The generally cylindrical bore of the internal slide that surrounds the barrel in service.

[0005] Entry Throat: An enlarged, obliquely oriented bore portion at the slide nose, contiguous with the primary bore, configured to allow oblique insertion and pivoting of the barrel monoblock into coaxial alignment.

[0006] Front Retaining Lip: An annular ridge at the slide mouth having a minor diameter smaller than a largest envelope of the barrel monoblock, and substantially fit for a sliding fit with the barrel, precluding axial passage of the monoblock in the assembled state.

[0007] Anti-rotation Interface: Complementary noncircular geometry between the internal slide and barrel monoblock that prevents rotation about the barrel axis (roll) while permitting axial reciprocation (e.g., inboard rails under a chord of the primary bore engaging monoblock flats / tracks).

[0008] Clocking Rails: Rails formed on the internal slide under a chord of the primary bore that extend parallel to the reciprocation path and engage complementary spaced apart tracks on the barrel monoblock to prevent roll while permitting axial motion. The axial key rails are not configured to provide primary' vertical or lateral guidance; radial load and pitch or yaw restraint may be provided by the cylindrical bore to barrel engagement.

[0009] Barrel Monoblock: An integral rear portion of the barrel that consolidates at least: (i) a feed ramp; (ii) receiver tracks sized to engage the internal slide’s inboard rails; and (iii) a transverse mounting aperture for fixing the barrel to a support structure (e.g., a modular acceptance frame) as a static datum. The monoblock flats / tracks may index the internal slide and provide roll constraint, while the cylindrical bore to barrel interface carries radial load and limits pitch or yaw. In some embodiments, the monoblock defines a pivot boss or aperture positioned to receive a magazine- powered slide-catch tab or bracket, enabling follower-driven actuation for automatic slide arrest and release.

[0010] Modular Acceptance Frame (MAF): A structural component within the upper assembly that receives and supports the barrel, internal slide, and associated subassemblies, and interfaces mechanically with the lower frame.

[0011] Chordal Underhang: A lower opening of the internal slide bounded in part by a chord of the primary bore, the opening span S being less than a diagonal envelope D of the barrel monoblock (S < D), thereby precluding bottom insertion / removal and enforcing a nonlinear assembly path in cooperation with a front retaining lip.

[0012] Diagonal Envelope (D): The maximum diagonal dimension of the barrel monoblock that governs passage through the slide’s nose or underside opening.

[0013] Binary Recoil Assembly (BRA): A recoil management subsystem that selectively bypasses a primary recoil spring during manual charging, while restoring full engagement during firing. Includes, without limitation, pivot block and cam cylinder variants designed to improve accessibility access for a broader spectrum of users.

[0014] Pivot Block: A rotating or pivoting element within certain BRA embodiments that alters the recoil spring load path between bypass and engaged states.

[0015] Cam Cylinder BRA: A BRA variant employing a rotatable cylinder with internal spline features to switch between bypass and engaged states via a cam path.

[0016] Cam BRA Phase: In-Phase means the patterned flange of the recoil guide may slide within the cam cylinder body, versus an Out-of-phase condition, where the cam cylinder body is out of alignment with the pattern, thus providing a rigid loading surface.

[0017] BRA Disengaged State: (Bypass / charge-assist) primary recoil spring not in the load path (reduced charging force); cam-cylinder in-phase; pivot-block ears in lower slot / relief path.

[0018] BRA Engaged State: primary recoil spring in the load path (guide translation compresses it); cam-cylinder out-of-phase; pivot-block ears in upper slot / engaged path.

[0019] Trigger Input Member: Any operator actuated member (pivoted or straight pull) provided for pressure response disengagement of the Firing Control Group (FCG).

[0020] Release Axis: The direction the sear moves to release the hammer, independent of the trigger input member’s motion path from a first position to a second position to release the hammer.

[0021] Chassis: A structure that may trap, index, and / or lock the upper assembly for human or remote operation. The term encompasses: (i) thin-wall or monocoque structures; (ii) integral or unitary frames produced by machining, stamping molding, casting, or additive manufacturing; and (iii) external carriers such as gimbals or mounts on vehicles or drones. A chassis may provide grip / ergonomic features, magazine presentation, sealing, and / or power / data routing. In embodiments the guidance and primary recoil reaction surfaces for cycling are disposed within the upper assembly (e.g., barrel guided breech, internal reaction faces), such that the upper can complete a firing cycle independent of chassis. Guidance and anti-rotation are provided by the internal slide-barrel / monoblock interfaces, not by the chassis. The chassis may receive forces and moments (e.g., recoil, accessory torque) and may provide supplemental reaction or constraint, but it does not define the guidance or delay elements required for the operating cycle; guidance and anti-rotation are provided by the interface between the internal slide and the barrel monoblock.

[0022] Situational Representation (SITREP): A time-aligned data set derived from one or more on- gun sensors and / or cooperating accessories that represents the firearm’s state and operation in realtime. SITREP outputs may present alphanumeric and / or bar-graph indicators (e.g., round count and capacity). SITREP may include time-synchronized data referenced to an external clock (e.g., GNSS or network time) and, where permitted, biometric inputs (e.g., heart rate, galvanic skin response, EEG). “HUD computer” means any cooperating off-gun device (e.g., optic-mounted module, head / wrist unit, mobile handset, body-worn computer) and may host any of the firearmelectronics functions, including GNSS, radio transceivers, secure elements, and data logging.

[0023] Support Structure: Any host to which the modular upper mounts, including a handgun grip frame, vehicle mount, unmanned aerial system pod. or robotic manipulator.SUMMARY[00241 Operating System & Structure (OSS):[00251 System Overview

[0026] In at least one embodiment, the operating system provides a registered non-moving barrel disposed within a reciprocating internal slide having a thin wall modular acceptance frame. A binary recoil assist (BRA) module may be positioned in-line with the recoil spring to provide selectable charging assistance without altering firing characteristics. The barrel may be structurally coupled to a forward escutcheon that interfaces with the lower monocoque frame, forming a continuous load path that resists bending moments from forward mounted accessories.

[0027] A forward portion of the internal slide may provide a front portion having a primary bore, and an enlarged angular bore that intersects the primary bore forming an oblique entry throat contiguous with a primary bore. During assembly, the barrel may enter through the entry throat at an oblique angle, pivot into coaxial alignment, and translate to a service position in which a front retaining lip and an undersized lower opening preclude linear removal. Inboard clocking rails positioned under a chord of the primary bore may engage complementary tracks on the monoblock to provide anti-rotation constraint. Primary radial guidance and pitch or yaw restraint may be provided by the cylindrical bore of the internal slide on the barrel OD; the axial clocking rails may serve primarily to index the internal slide (roll lock) rather than to constrain vertical or lateral motion. This geometry may preserve sight to bore alignment, stiffen the nose without a threaded cap, reduce debris ingress, and stabilize rotary cooperation with a spring engagement controller (BRA).

[0028] In analyses of common pistol architectures, there are on the order of a dozen operable fit interfaces between frame and barrel assemblies, with additional interfaces associated with barrel lockup; maintaining functional reliability across so many interfaces either increases manufacturing cost through precise machining, or, if tolerances are relaxed, results in diminished uality and performance. These interfaces can contribute substantially to manufacturing cost because many are held by restrictive tolerances or require hand fitting. In the embodiments described here, alignment and lockup control are provided by two principal fit interfaces, the axial clocking rails are defined by intersecting datum features that are straightforward to manufacture and control.

[0029] In this configuration, the barrel may function both as the ballistic conduit and as a primary structural member maintaining sight to bore alignment under operational loads. The coaxial internal slide may cycle within the sealed chassis to reduce reciprocating mass and environmental ingress, while a toolless upper / breech interface may allow reconfiguration without disturbing the zero of attached optics. This integrated architecture may distinguish some embodiments from tilting barrel designs by preserving barrel alignment, improving zero repeatability, and enabling direct, stable attachment of muzzle mounted devices without recoil boosters.

[0030] The non-linear assembly path may enable a closed, rigid nose without a removable cap, while the keyed anti -rotation interface may yield true axial motion, BRA timing stability, reduced edge loading, and lower tolerance stack-up from magazine to chamber.

[0031] Low Mass Operating System (LMOS) & Polar Moment of Inertia (MOI)

[0032] In representative builds, the reciprocating internal slide is a low mass operating system (LMOS) with mass concentrated radially proximate the barrel axis, yielding a polar moment of inertia about the barrel axis substantially lower than external slide architectures of comparable barrel length. By arranging the primary cylindrical bearing between the slide and barrel to carry radial loads (limiting pitch or yaw) and using a keyed anti-rotation interface to prevent roll, the system operates reliably with reduced reciprocating mass while preserving guidance quality. Consequences include smaller sight trace excursions, faster return to center, lower impact energy at stroke limits (for a given springing), and reduced shock into non-reciprocating optics. (Illustrative example data may demonstrate greater than 50% reduction in reciprocating mass and -90-97% reduction in Polar Moment of Inertia (MOI) versus common external slide designs; values are non-limiting and may vary' by configuration.)

[0033] Representative parameters (non-limiting). By way of example for a 9x 19 mm +P configuration, a reciprocating internal slide (which may have a mass of 180-220 g) and a primary recoil spring rate of about 103-114 Ibf / in (18-20 N / mm) may be employed. A binary' recoil assist window may span an initial approximately 0.47-0.71 in (12-18 mm) of handle travel and provide an apparent force reduction of at least 80%. Under these conditions, the reciprocator’s polar MOI about the barrel axis may be reduced by 90% or more relative to a typical external slide of equal barrel length. These values are exemplary only and may be varied according to application.

[0034] Perceived Recoil & Handling

[0035] The reciprocator is configured with reduced mass and is located proximate to the bore axis, which may reduce roll and pitch moments during cycling and may reduce muzzle excursion during repeated shots. Optics are mounted to a fixed lower monocoque frame such that the sight windowremains stationary relative to the receiver and optical zero is maintained during operation. The architecture may accommodate suppressors and compensators because additional muzzle mass is not coupled to the reciprocator. Where provided, the BRA mechanism decouples manual charging effort from the return spring rate, permitting higher firing cycle spring rates while maintaining manual charging effort within a desired range and providing defined control of the firing state.100361 Breech & Extraction Assembly

[0037] In at least one embodiment, a fastenerless, toolless upper module contains an internal slide containing a breech element, an extractor, an ejector, a firing pin subassembly, and at least one passive safety member. Components are retained by interlocking geometry’ with 3D keyed seats, mating shoulders, and detents; a single captive latch or transverse pm secures the module, and subcomponents may remain captive during removal / installation. Field stripping or teardown may be performed by reversing the sequence, eliminating punches, fixtures, or bench tools.

[0038] A barrel rigidly retained within the modular acceptance frame functions as a primary structure while maintaining co-axiality between the bore and optical / accessory mounts and resisting bending moments from muzzle mounted accessories. Because the barrel remains stationary relative to the chassis and sighting systems during firing and cycling, suppressors, compensators, or other muzzle devices may be rigidly attached without altering cycle timing or point of impact, without requiring recoil boosters, and without inducing flex or misalignment. In one embodiment, the barrel is rigidly retained within the chassis.

[0039] Cross-dependent retention may be employed so parts are released only when adjacent components are intentionally removed. In some configurations, a firing pin block may serve as a primary' retention means which operatively secures numerous components, while itself is constrained once the internal slide is inserted within the modular upper frame. These measures can enhance safety, streamline service, reduce loose parts, lower manufacturing cost, and promote alignment across builds or calibers. With the upper module installed and aligned, recoil and charging forces may be managed by a Binary' Recoil Assembly (BRA) as described below, 'hich may provide a two position recoil assembly bypass mechanism having a first and second operative position.

[0040] Binary Recoil Assembly (BRA) BypassIn certain configurations, a self-loading firearm may employ a binary recoil assembly (BRA) having (i) an energized state in which a primary’ recoil spring remains in the firing load path and (ii) a bypass state in which the spring is selectively decoupled to ease manual charging. The BRA may operate independently of any firing phase delay' and may' supplement (or in low er pressureembodiments obviate) the need for separate delay mechanisms (such as but not limited e.g., cam, roller, or gas delay), allowing higher energy cartridges to be managed while maintaining manageable charging effort. Decoupling the spring during charging preserves the accuracy benefits of a strong firing state spring without typical ergonomic penalties of direct or delayed blowback systems.

[0041] The spring engagement controller may employ rotary cooperation on a coaxial cylindrical bearing to suppress pitch and yaw that could prevent cam contact, while an anti-rotation feature maintains slide indexing, so engagement and bypass occur at repeatable positions across cycles. The charging handle may first traverse a lost motion dwell in which a cam under the handle depresses tabs on a block to enter the bypass state before the handle couples to the internal slide; return toward home can allow the block to rotate to the firing state. For higher energy’ cartridges and / or suppressed use, a mechanical or gas delay may be used in combination with the BRA to manage early chamber pressure while retaining charge assist ergonomics.

[0042] In some embodiments a non-reciprocating charging handle may include a lost-motion segment that provides an initial dwell during which handle travel does not translate the internal slide. During this dwell, an actuator cam pin driven by the handle can reconfigure the springengagement controller into a bypass (charge-assist) state; when the handle returns toward a home position, the same cam pin may back-drive the controller to restore full engagement for firing. By way of example and without limitation, the bypass (charge-assist) state may reduce the apparent initial charging force by at least a majority (e.g., about 80-90%) over an initial assist window of travel, subject to spring selection and cam geometry.

[0043] While many embodiments employ a Binary Recoil Assembly (BRA) to selectively bypass a primary recoil spring during manual charging, the operating system is not limited to use of a BRA. In other embodiments, the internal slide may be biased solely by a single recoil spring or a composite spring pack without any bypass features. Such configurations retain the fixed barrel, coaxial internal breech architecture and associated structural, accuracy, and serviceability advantages described herein; they may exhibit higher manual charging force but otherwise operate as disclosed.

[0044] Representative pivot block embodiment. In some versions a high load compression spring may reside on a guide rod reacting against a forward recoil flange positioned near the bore axis. A pivoting recoil block, optionally sharing support with a trigger input member axle and / or barrel pin, can rotate under bias from an auxiliary spring. Opposed tabs on the block may track a lower cam disposed beneath a non-reciprocating charging handle; when the handle is draw n rearward thecam surfaces may depress the tabs, rotating the block downward into a bypass position. In that orientation a forward clearance surface may open a clearance tunnel sized to admit the spring / guide with substantially reduced resistance, while a rear surface may preload a return feature for the handle. Releasing the handle (or reaching a defined point in the operating cycle) may enable the block to rotate upward again, restoring the engaged path so the main spring resumes absorbing slide energy during firing.

[0045] In other versions having a lower tube of the modular frame may house a second rotatable recoil tube having (i) an external cam track having a first and second end and (ii) an internal noncircular spline terminating at a blind flange. The tube can pivot on a barrel mounted boss. A secondary rail with a complementary spline and a forward spring boss may slide within the tube and support a lighter secondary return spring. A charging handle associated with an angled block and cam pin may be linearly guided within a longitudinal seam and engage the tube’s cam track. With the handle at rest, the cam pin can hold the recoil tube out-of-phase with the rail’s spline so the tube serves as a reaction surface for the primary recoil spring. An initial lost motion dwell may rotate the recoil tube into phase to establish the “Bypass State’’ prior to handle to slide coupling; as the handle approaches its home position on return, the cam can rotate the tube out-of-phase to restore full “Engaged State”. When the handle is retracted, the cam pin may rotate the tube into phase, permitting the rail (and thus the uncompressed primary' spring) to translate rearward, and in some cases within the translatable resistive surface, while a lighter secondary' return spring biases the internal slide. A charging pin on the slide may enter a frame cam slot to trigger a consistent “slingshot” release that returns the slide forward under controlled force, with the non-reciprocating handle managing bypass timing.

[0046] The BRA controller may be characterized by: (i) a firing state with full spring engagement; (ii) a dwell actuation interval in which handle motion reconfigures the controller without translating the internal slide; (iii) an assisted draw interval where apparent charging force is reduced; and (iv) a restore interval as the handle returns to a home position and re-engagement occurs. In some implementations, a firing interlock may be configured such that release is permitted only when the controller is in the firing state and the slide is in battery. The charging handle may include tactile and / or audible indications upon entering the assist state and upon reaching the home position, and can be guarded or shaped to mitigate inadvertent actuation during firing.

[0047] These embodiments are illustrative and non-limiting. Other geometries, linkage schemes, timing strategies, materials, and spring constants may be employed. Features described inconnection with one embodiment may be combined with features of another unless context dictates otherwise to affect various desired performance metrics.

[0048] Simulations of the binary recoil bypass mechanism have shown that decoupling the primary recoil spring during charging allows the use of stronger firing state springs without adding strain to the shooter. This makes the platform compatible with higher energy' cartridges while preserving manageable manual cycling effort. The ability to switch between bypass and engaged modes without tools or disassembly enhances adaptability in the field, while the enclosed coaxial arrangement keeps the system sealed from debris that may compromise reliability in traditional open rail recoil assemblies.

[0049] Charging System

[0050] In various embodiments a dedicated charging handle may sleeve over a modular acceptance frame, so the frame’s outer diameter serves as a linear guide. The handle can present a generally tubular body with a chordal underside that wraps partially beneath the frame centerline to inhibit vertical removal while permitting longitudinal travel. Depending on the recoil bypass variant selected, the handle may cany’ (i) a lower cam surface positioned to actuate a pivot block BRA and / or a slide release lever, and / or (ii) an angled block with a cam pin arranged to engage a timing cam of a cam cylinder BRA. Once charging and reset behavior is defined, other user controls may follow the same toolless, ambidextrous design language.

[0051] The charging handle interfaces described herein function with or without a bypass mechanism; where no BRA is present, the handle acts directly against the recoil spring and slide lugs with identical geometry.

[0052] During manual charging the handle can traverse an initial low load segment in which the cam surface or cam pin disengages the BRA, thus allowing the high-rate recoil spring to be bypassed. In this segment the internal slide may retract substantially against a lighter return path and ancillary loads (e.g., hammer cocking), reducing perceived effort. Through mid stroke the bypass condition can remain in effect; near end of travel the geometry may reintroduce selected spring energy so that an automatic release of the slide’s charging pin propels the internal slide forward under controlled force to a repeatable strip point.

[0053] Method of operation binary recoil assist (representative). (1) With the handle at home, the controller may reside in an engaged state. (2) During initial handle travel a lost motion dwell rephases the spring engagement controller to bypass. (3) The internal slide retracts under reduced apparent force while the primary recoil spring is bypassed. (4) Near end of stroke, the spring’sresidual energy returns slide. (5) As the handle returns, the cam restores full engagement and rearms the bypass system to resist recoil prior to the next firing cycle.

[0054] Certain versions may position aft vertical faces of the handle to bear directly on charging lugs at the rear of the internal slide, providing a positive mechanical interface for manual retraction regardless of BRA state. Cam slopes, dwell lengths, and relative rates of primary' and return springs can be selected so forw ard closure speed and release position remain substantially constant across magazine fill levels and ammunition types. The handle may be biased forward by its own return element and can be configured not to reciprocate with the slide during firing, preserving a flush exterior. In some embodiments a single handle body could accommodate both BRA variants by incorporating both the lower cam profile and the cam pin subassembly.

[0055] This charging interface enables rapid, consistent manual cycling regardless of recoil bypass state, with a low-load initial stroke that reduces operator fatigue. Because the handle does not reciprocate during firing, exterior ergonomics remain streamlined, reducing snag hazards. The guided return and timed reengagement of the bypass mechanism produce uniform closure speed across varying ammunition ty pes, ensuring predictable chambering and engagement in both range and combat environments.

[0056] In some embodiments the firearm may include a reciprocating or non-reciprocating charging handle slidably mounted within opposed side channels of the lower monocoque chassis “house.” The handle may be formed from a high conductivity' material (e.g. 7075-T6 aluminum alloy) and arranged in defined thermal communication with a slide mounted boss, cam surface, or other contact pad of the coaxially guided breech. This contact may be established directly or through a compliant thermal interface layer (e.g.. graphite, copper, or a tribological coating with high thermal conductivity) so that heat conducted from the barrel into the internal slide is preferentially transferred into the handle body.

[0057] The exterior of the charging handle may define a series of protruding ridges, serrations, or traction elements along its length. While dimensioned and oriented to promote positive manual engagement, these elements are also provided as extended surface fins that increase convective and radiative heat dissipation. The serrations may be longitudinal, diagonal, or segmented, and may extend into or through the handle body to form vent passages that align with the monocoque’s side channels, thereby creating a ducted airflow path during weapon movement and natural convection. In certain examples, the serrations are visually and functionally indistinguishable from conventional grip geometry, concealing the integrated thermal management function.

[0058] Lateral standoffs or insulating pads between the handle and the lower chassis may inhibit conductive heat transfer to user contact surfaces, while a high emissivity surface finish (e.g., black hard anodizing) on the handle promotes radiative cooling. This dual-purpose geometry enables the charging handle to operate both as a primary manual actuation device and as a removable, serviceable heat sink for the breech / barrel assembly, lowering peak slide temperatures during burst fire and reducing steady state operating temperatures in suppressed or high-volume firing scenarios.[00591 Modular Upper AssemblyIn various embodiments, a modular upper assembly comprises components for completing a firing cycle may include a fixed barrel, a coaxially guided internal slide (breech), an dual spring recoil system, and, in some configurations, a firing control group (FCG). The upper may further include a forward escutcheon, a modular acceptance frame (MAF), and locking geometries that interface with a chassis.

[0060] The upper may be structurally self-contained for cycling: it may carry reaction surfaces, guidance interfaces, and operating springs such that it can be actuated outside any lower frame or grip. This can permit a common upper design to be mounted to different chassis types, including handheld frames, vehicle mounts, or aerial pods. In representative embodiments, the FCG may be mounted to the upper, allowing the trigger input member mechanism to be removed, serviced, or swapped together with the barrel and slide; this can enable rapid reconfiguration and simplified logistics compared to platforms where the FCG is embedded in the lower receiver.

[0061] The barrel may function as a fixed, loadbearing element within the upper, pinned or otherwise rigidly secured to the MAF. The internal slide may be coaxially guided by the barrel and may incorporate an anti-rotation interface (e.g., inboard rails under the chord of the slide’s bore engaging complementary tracks on a barrel monoblock). In certain embodiments, the barrel may be installed into the internal slide via angular insertion and pivoting, then drawn rearward into final position, enabling compact, precise coaxial alignment without external rail guidance.

[0062] The forward escutcheon may secure the MAF front and may interface with the chassis to resist fore-aft motion, while a rear MAF overhang may register beneath a corresponding chassis roof to constrain vertical and lateral movement. This multi axis geometric locking can maintain alignment without conventional pinning and can enable quick, toolless assembly and disassembly.

[0063] In some embodiments, the operating system may include a selectable binary recoil bypass mechanism (BRA) that may reduce manual charging effort while retaining strong firing state spring bias; alternatively, a conventional non-bypass spring may be used. With the fixed barrel andenclosed, coaxially reciprocating slide, the architecture can reduce point of impact shift, support rigid attachment of suppressors or compensators without cycle disruption, mitigate muzzle rise, improve environmental sealing, and permit reconfiguration without loss of zero.

[0064] Unlike Browning type tilting barrel systems (where the barrel translates and unlocks via cam paths or links) the barrel here may remain rigidly coupled to the upper and coaxially engaged with the internal slide, which may simplify tolerances and support stable forward mounted accessories.[00651 Assembly & Capture Geometry:

[0066] A forw ard portion of the internal slide defines a two stage bore comprising a primary cylindrical bore and an enlarged, obliquely oriented entry throat. During assembly, the front diameter of the barrel pilots through the oblique entry throat up to the monoblock, after which the barrel is tipped into coaxial alignment so that anti-rotation flats on the barrel monoblock register with inboard rails positioned under a bore chord, and the assembly is translated to a service position. The front opening of the internal slide may have a minor diameter smaller than a maximum transverse dimension W of the monoblock portion (measured normal to the bore axis), which is configured to preclude straight axial passage of the monoblock through the front opening; an underside window adjacent the angled throat may have a span S smaller than W, which is configured to preclude vertical drop in or drop out while still permitting oblique insertion and tip in through the angled throat. In the assembled state, a forward portion of the barrel remains extended through the front end opening of the internal slide throughout the full range of reciprocation and concurrently cooperates with a recoil surface of the internal slide. These continuous engagements, together with the capture geometry, are configured to preclude removal along any linear path and to constrain all degrees of freedom except axial reciprocation, thereby constraining assembly and disassembly to a deliberate angular insertion path. In representative forms, S < W and the front opening minor diameter is less than W, thereby eliminating any linear insertion or removal path while still permitting an oblique insert, tip in, and translate sequence via the entry throat.

[0067] In service, primary guidance is provided by the primary cylindrical bore of the internal slide on the cylindrical barrel OD (to maintain a tight sliding clearance fit), which limits pitch and yaw. Complementary flats on the monoblock portion engaging inboard rails under a chord provide antirotation about the bore axis to maintain a fixed circumferential datum. This coaxial slide on barrel architecture may improve stiffness to weight ratio, preserve bore to sight alignment, and promote smooth cycling compared to designs in which the slide is frame guided or the barrel is not the primary slide support.

[0068] In representative forms, the inboard rails positioned under a chord of the internal slide are inherently formed by general machining rather than specialty rail cut operations: when the slide's outer diameter and its coaxial internal primary bore are established, and the underside window is cut, the intersection of these features creates the two rail faces under a chord. Their location and planarity may thus be defined from simple coaxial surfaces and the window geometry, without broaching, EDM, or separate rail inserts.

[0069] In some embodiments, the entry throat is oriented at an oblique angle of about 10°- 45° to the primary bore axis (e.g., 20°-30°). The front opening minor diameter and the underside window span may be selected with a clearance margin A relative to W to preclude linear passage, while the entry throat provides clearance for the barrel diameter along the oblique insertion and pivot path. Angular constraint is provided primarily by the rail / flat engagement, permitting normal radial clearance between the primary bore and barrel OD.

[0070] Thermal Wicking Charging Handle

[0071] In some embodiments, the Modular Upper Assembly includes a charging handle configured both to facilitate manual cycling of the internal slide and to promote heat transfer away from the barrel and breech region through conduction. The handle may be formed of a high thermal conductivity material, such as an aluminum alloy, and positioned near a hot portion of the barrel assembly. Grip features such as serrations or fins may increase exposed surface area and encourage airflow.

[0072] Integrated FCG with Upper Assembly:

[0073] In various embodiments, the Modular Upper Assembly (“MU A”) may integrate at least part of the Firing Control Group (“FCG”) within the same removable module that houses the breech, locking, and cycling mechanisms. In representative, standard configurations, the lockwork (i.e., the hammer, sear-disconnector, hammer thrust strut, and associated biasing spring(s) that effect locking, releasing, and disconnecting of the hammer and sear assembly) may be carried by the MU A, while a trigger input member (e.g., trigger, trigger bar, or other input linkage) may be carried by the lower or chassis. This division can permit the upper to be removed with its lockwork intact for servicing, inspection, or reconfiguration without disturbing the lower. In at least one example of the invention, a push button cocking system may be provided.

[0074] The MUAmay nevertheless remain substantially FCGagnostic: in other versions, the entire FCG (hammer or striker fired) may be carried by and removed with the MU A; conversely, some or all FCG elements may be carried by the lower, or the trigger input member may be hosted by the upper to form a unitized, upper carried FCG. In some representative forms, the MUA mayincorporate the inventive sear-disconnector system and may support an integrated push button cocking mechanism.[00751 Structural Retention & Self-Sufficiency:

[0076] The MUA may be retained to the firearm platform using geometric interlocks and minimal fastening hardware, rather than conventional pinned connections. In some embodiments, a front escutcheon may secure to the chassis or lower, abutting the forward end of the modular acceptance frame (MAF). The MAF may extend rearward beneath an overhanging "‘roof” portion of the lower monocoque, with side risers constraining it laterally and the roof providing vertical retention. This multi-axis retention may inhibit rearward, upward, and lateral displacement, while allowing the MUA to be detached quickly when required. In certain arrangements, the MUA may remain structurally self-sufficient and operational without the front escutcheon, and may couple to alternate chassis systems, such as a drone, vehicle cradle, or bench fixture, via the MAF’s locking geometries or an escutcheon compatible adapter, thereby demonstrating independence from the lower chassis for core operation. In some embodiments, the structure vary wildly including but not limited to robotics, enclosures like briefcases, exoskeletons, garments, etc.100771 Independent Operation and Alternate Mounting

[0078] In some versions, the MUA can contain the complete operating cycle (including locking, cycling, feeding, extraction, and optionally the FCG) so that it may function without the lower chassis or grip frame. The recoil and return forces may be primarily reacted within the MUA itself, with the chassis serving as a mounting structure and secondary reaction point. This independence can permit the MUA to be mounted to unconventional supports such as lightweight drone frames, remote weapon stations, tripods, or specialized housings, without requiring a traditional firearm lo er. The system may be configured with or without a Binary Recoil Assembly (BRA), allowing substitution of alternative recoil systems for specific applications. As used herein, support structure encompasses a handgun grip frame, vehicle mount, unmanned aerial platform mount, or robotic manipulator; the lock assembly may reside entirely on the modular upper, with a remote trigger input member actuator on the support structure coupled via a mechanical, electrical, magnetic, or pneumatic, optical, or fluidic actuation interface.

[0079] Thermal Gradient & Material Layering

[0080] The modular upper assembly may include components formed from materials selected to balance strength, weight, and thermal conduction properties. In some embodiments, differing metallic families may be arranged to facilitate conductive pathways for heat dissipation. The barrel, internal slide, and adjacent support members may be formed of corrosion resistant alloys, forexample stainless steels selected to provide compatible thermal expansion, complementary hardness, and fine bearing finishes. At least one mating surface may receive a hard surface treatment or coating to inhibit adhesive wear and galling during reciprocation. In representative constructions, the layered arrangement establishes conduction paths that wick heat from the barrel and internal slide into the handle and other heat spreading members, while clearances are set to accommodate differential thermal growth. By moderating peak temperatures, the arrangement can support component durability, lubricant life, and user comfort during extended operation.100811 Chassis System

[0082] As used herein, “chassis” refers to any structure or body that traps, indexes, and / or locks the functional upper assembly for operation by human or remote actuation. A chassis may optionally provide magazine presentation, ergonomic grip interfaces, accessory mounting, environmental sealing, or routing for power and / or data.

[0083] In representative configurations, the primary guidance and primary recoil reaction surfaces required for the operating cycle are disposed within the upper assembly (e.g., barrel guided breech, internal reaction faces), enabling the upper to complete a finng cycle independent of any chassis. The chassis may receive and distribute resultant loads (e.g., net recoil impulse, muzzle device torque, handling forces) and may provide supplemental constraint or reaction, but it need not define the essential guidance or delay elements for the cycle. (See Assembly & Capture Geometry for upper barrel coupling and guidance.) The term “chassis” as used herein may encompass, without limitation:

[0084] Thin -wall Monocoque Chassis (Preferred)

[0085] In some embodiments, a firearm platform may employ a thin-wall chassis formed from sheet or coil stock. The chassis may enclose a modular upper receiver with a coaxially reciprocating internal slide and provide protective structure and interface points for accessories and mounting while shielding moving components from environmental exposure.

[0086] The thin-wall chassis may be produced predominantly by forming and cutting operations (e.g., stamping, laser cutting, folding, drawing, explosive fabrication, additive manufacturing, or flow forming) rather than billet machining. Nested layouts may lower waste, setup time, tooling wear, and powder consumption. Critical tolerances can be maintained with dedicated dies, gauges, or fixtures, reducing reliance on multi-axis machining which supports rapid mass production and assembly.[00871 Unitary or Machined Lower Frame

[0088] In other embodiments, at least one of the lower monocoque assembly, front escutcheon, modular acceptance frame, or lower grip frame may be produced as a single piece element by machining, molding, casting, forging, or additive manufacturing. Such unitary constructions may simplify assembly, provide integral strength, or adapt the system for high-volume production. All functional and operational advantages disclosed herein for the thin-wall embodiment are equally applicable to these integral forms, unless expressly stated otherwise.[00891 External Carrier or Drone Mount

[0090] In certain configurations, the chassis may take the form of an external carrier, such as a gimbal, pod, plate, or mount on a vehicle or drone. In these embodiments, the chassis provides mounting and indexing for the upper assembly, may route control signals and power for remote actuation of the firing control group, and can integrate shock isolation or recoil management features. The drone mounted chassis may incorporate lightweight materials but not limited to (e.g., carbon fiber composites, titanium) to minimize payload while providing secure engagement with the upper’s locking features.[00911 Optional Embodiments

[0092] Additional chassis embodiments may include tripod plates, PDW shoulder stocks, robotic manipulators, weapon stations, or other fixtures that capture the upper module via its standardized locking geometry. Each variant can be adapted to the same functional upper without alteration to the core operating system, maintaining cross platform interchangeability.[00931 Magazine Release

[0094] In some embodiments a magazine release assembly may employ mirror image lever halves joined by a stamped, sheet metal coupling bracket. Because each side can use the same lever geometry, a single bilaterally symmetric lever design may satisfy left and righthand operation, simplifying tooling, reducing inventory, and streamlining senice. The coupling bracket can mechanically link both lever hubs and may capture a biasing spring so the subassembly remains robust, economical to manufacture, and serviceable without loose microparts.

[0095] Conventional releases often rely on multiple small components that can be lost or require tools, while polymer paddles may pivot on roll pins with compression springs that feel insubstantial, and heel type latches can hinder singlehanded operation. The configuration described here may address these issues by providing metal on metal control surfaces with bilateral access, positive tactile feedback, and field serviceable construction.

[0096] Representative embodiments may position identical lever halves on opposite sides of the magazine well, each pivoting on a hub that passes through a frame bore. Inner hub ends may interlock with the coupling bracket, which retains a spring that biases both levers outward so their catch faces seat in a magazine notch. Depressing either lever can rotate both halves in unison to withdraw the catches; releasing finger pressure allows the spring to return the levers to a locking position. Because the bracket captures the spring, the complete assembly may be withdrawn from the frame as a unit to facilitate safe maintenance.

[0097] Manufacturing efficiency can be enhanced by production of one bilaterally symmetric lever style that may be used for both sides and forming the coupling bracket from flat sheet. Detents, overtravel stops, and debris resistant clearances may be incorporated into lever hubs and frame bores so engagement remains positive and return reliable. The interface to a magazine notch may be sized or profiled to suit different magazine designs without altering the underlying ambidextrous mechanism. Taken together, the symmetric lever halves and sheet metal coupling bracket can yield a durable, low part count.

[0098] The use of identical lever halves minimizes manufacturing complexity and spare part requirements, and the captive spring and bracket arrangement prevents small part loss during maintenance. These attributes improve both the user experience in high stress reloads and the long term serviceability of the platform.

[0099] Locking Mechanism

[0010] In various embodiments, the upper assembly may be joined to a lower chassis by a quick detach locking mechanism that carries working loads, resists unintended release, and may provide a visual state indication. Interface geometry may be selected so accessory torque at the muzzle may tend to increase the clamping load across the joint rather than pry it apart.

[0101] In one embodiment, a captive rotary cam pin with a spring biased follower engages detents formed in the lower. A partial rotation between indexed states captures or releases the upper while a head or collar provides a visible indication. The pin may bear on a counterbore and seat in shear across walls of the upper and low er to establish defined load paths for recoil and off axis moments.

[0102] In another embodiment, a front escutcheon couplable to the upper may provide a fixed latch bar with spring loaded locking members. During insertion, chamfered features of the spring-loaded locking members may cam them inward to clear mating windows in the lower monocoque grip frame; upon passing the windows, the locking members may spring outward to lock. To release, an actuator may cam the locking members inward to disengage. A cooperating overhang region can provide a secondary geometric lock that supplements the locking member engagement.

[0103] Either mechanism may interface with modular acceptance frame (MAF) interlocks, preserve zero through repeatable locating features, and adapt to alternate chassis (for example, a drone system or pod cradle) using the same locking geometries or an escutcheon compatible adapter.

[0104] Firing Control Group (FCG) Geometric Disconnector & Push Button Cocking System:

[0105] In some embodiments a firing control group may implement geometric disconnection produced by cam interaction and cooperation between a shaped upper surface of a sear and a complementary cavity of a hammer. When a slide (or an internal breech element) drives the hammer travel slightly past a full cock lock angle (on the order of a few to several degrees beyond lock, e.g., roughly around ninety degrees from a fired position), the hammer cavity can bear on the sear’s upper surface. The geometric disconnector is independent of whether the trigger input member pivots or translates; disconnection results from controlled hammer overtravel. Because the sear may be mounted on the same pivot via longitudinal guide slots, the contact can act about a forward fulcrum established by those slots and rotate the sear so a forward tip lifts clear of both trigger input member engagement ledges while the trigger input member remains held. The arrangement may achieve disconnection without a separate disconnector and without a slide induced “sear dip,” which can stabilize timing under shock.

[0106] In various embodiments, the thin- wall chassis system, internal slide, and operating system may be configured to accept a variety of firing control group (FCG) and ignition system designs, making the platform substantially FCG agnostic. In striker fired embodiments, the sear may retain a striker lug rather than a hammer. A shaped cam region on the striker (or an intermediate cam shoe) may cooperate with the sear’s upper cam surface during striker overtravel to produce the same geometric disconnection while the trigger input member is held. The push button cocking actuator may translate the striker rearward to a captured position without actuating the FPB lift. This compatibility extends to both hammer fired and striker fired arrangements. In its current form, the inventive sear-disconnector FCG is implemented in a hammer based configuration and is mounted to the upper assembly, which substantially comprises the modular acceptance frame and front escutcheon. This mounting arrangement allows the entire FCG to be removed together with the upper assembly, enabling rapid servicing, inspection, and modification without disturbing the lower monocoque chassis. In some embodiments, the hammer based FCG further enables an innovative pushbutton “re-mode” cocking system; however, this pushbutton re-mode concept is equally adaptable to striker fired embodiments without altering the core chassis or operating system. By contrast, in many conventional firearms such as the M1911, the FCG is embedded within the grip frame, requiring partial or complete disassembly of the low er frame for access.Mounting the FCG to the upper assembly not only improves serviceability but can also contribute to structural rigidity and modularity, allowing for simplified interchange of complete upper units containing different trigger input member configurations.[01071 FCG Partitioning:

[0108] In some embodiments, the lockwork (e.g., sear, hammer, and thrust strut) may be hosted by the upper assembly while the trigger input member resides in the lower for serviceability and packaging benefits. In other embodiments, the trigger input member may also be hosted by the upper to form a unitized upper carried FCG; in still other embodiments, some or all of the FCG may be carried by the lower. The partition may be selected to suit packaging, stiffness, or serviceability targets and is not required for the cam based geometric disconnection described herein.

[0109] Best mode and alternatives. In some builds, locating the lockwork within the upper is preferred for packaging efficiency, stiffness, and service access to the fire-control group while maintaining a thin lower. Equivalent embodiments may instead locate (i) the trigger input member in the lower with the remaining lockwork in the upper, (ii) the entire fire-control group in the lower, or (iii) a split arrangement, to suit platform constraints, or legal / jurisdictional requirements.

[0110] In some embodiments, a single compression mainspring reacts against a frame fixed reaction surface and acts through a thrust strut to provide both hammer drive torque and sear reset bias. The reaction surface can be provided by a portion of the modular acceptance frame, for example a ledge, boss, or wall, and in certain versions may include a bore or bushing that guides the thrust strut. The spring axis and strut moment arm may be arranged so that the resultant thrust pulls away from the direction of the hammer pivot at the point of application, enabling compact packaging of an enclosed hammer and a rear cocking actuator while reducing lateral loads at the pivot.

[0111] Manual cocking may be achieved by a spring returned rear button acting on the thrust strut through a cam or ramp interface to compress the mainspring and rotate the hammer to full cock without moving the slide or breech. Throughout the button stroke a Firing Pin Block (FPB) may remain engaged because the button path does not perform the trigger input member’s lift function. The button can be hard stopped to limit travel; it need not latch, with the cocked state defined by sear capture. One-handed cocking may therefore be performed without altering grip, while maintaining passive safety interlocks.F01121 Sear

[0113] In certain embodiments, a unified, U-shaped sear includes opposed legs that define longitudinal guide slots sized to receive a hammer pivot pin and to permit limited translation with controlled rotation about that pin. Forward pylons (lift tabs) are engaged by a first, substantially vertical lift surface on a trigger-input member; rear faces include (i) a primary engagement surface for hammer retention and (ii) an upper cam surface that cooperates with the hammer during overtravel (e.g. approximately 5-10 degrees) to accomplish geometric disconnection. As the trigger-input member pivots, the lift surface drives the sear along a curvilinear, oblique path having upward and rearward components sufficient to clear the firing-pin block (FPB). Sear contact surfaces may be ground or polished to low roughness to promote a crisp break and long wear life.

[0114] In at least one embodiment, when cocked, the sear may retain the hammer on the primary engagement face. During a trigger stroke the trigger input member can first elevate the sear enough to clear an FPB interface and then drive the sear rearward and / or downward to release the hammer. If the trigger input member remains held, hammer overtravel may act on the upper cam surface to produce the off notch condition and disconnect the trigger input member without a separate disconnector. While the action cycles, mainspring thrust through the strut can bias the sear forward; when the user allows the trigger input member to move forward, the sear may drop to an intermediate relief shelf and then to the primary engagement surface, ready for the next shot. The third-class lever geometry between hammer and sear may increase locking force under impact, enhancing drop safety.

[0115] Hammer

[0116] In various embodiments, a spurless internal hammer may pivot about a hammer axle axis that may be collocated with, or shared as, a sear pivot axis and define a full cock notch for primary sear engagement, a shaped cavity that cooperates with the sear’s upper cam surface during overtravel, and a strut boss that receives mainspring thrust. The hammer profile and linkage geometry may be configured so that the hammer rotates through a greater than typical angular arc to reach the full cock lock condition (e.g., on the order of a right angle from a fired position), thereby providing increased mechanical advantage for manual cocking and a defined margin for controlled overtravel. Within that narrow overtravel domain (entered primarily during charging or live recoil) the cavity may lift the sear clear of both trigger input member ledges while the trigger input member is held, thereby achieving disconnection without slide driven sear depression. Optional inertia relief features (e.g., cuts or apertures) may be included to reduce susceptibility to hammer follow under sudden shock.

[0117] Wear surfaces (non-limiting). Sear and hammer engagement faces may be ground or lapped to a finish of <16 pin Ra (<0.4 pm Ra) and hardened to about HRC 58-62 (hardened tool steel or equivalent). Equivalent materials, heat treatments, and surface processes may be employed to achieve comparable wear resistance and stability.[01181 Method of Operation:

[0119] Method of operation for the fire control cycle (embodiment with trigger input member and sear bar). Upon trigger actuation, a first feature of a trigger input member may elevate a front portion of a biased sear bar to lift an optional firing pin block from a blocking position. With continued trigger travel a second feature of the trigger input member may drive the sear rearward along a release axis, withdrawing a sear face from a hammer notch and thereby releasing the hammer. After discharge, as the cartridge is expended, the slide may reciprocate and return to re mode the hammer to an out of bounds reset position beyond normal sear engagement. In that position a surface within a pivoted hammer cavity may bear directly on an upper region of the sear, urging the sear downward at that point and, about the sear fulcrum, lifting a forward region acted upon by the trigger input member. This interaction may separate the sear from the trigger input member, whereupon a sear spring may bias the sear back into the hammer cavity and re engage the hammer sear face with a lower engagement surface of the sear nose, thereby re-moding the hammer. Upon release of the trigger the trigger input member may return, and the sear may remain engaged, restoring the system to a ready state. Equivalent geometries and actuation sequences may be employed, with or without the firing pin block.

[0120] Push Button Cocking

[0121] In some implementations, a rear pushbutton cocking actuator may engage the hammer strut directly; in certain versions, the user exposed button may be integral with the strut. Depressing the button may compress the mainspring and rotate the hammer to a full cock condition, at which position a sear may capture the hammer in a full cock notch. In some embodiments, the hammer thrust strut may have a portion of the body formed in such a way as to allow the hammer to nest into it at the hammer’s pivoted full extent. The button may return automatically under spring bias when released, or it may translate with the strut to provide a visual and / or tactile indication of cocked state. The actuator path may be arranged such that a firing pin block (FPB) remains engaged throughout the button stroke; the button does not perform the trigger input member’s FPB lift function. Overtravel stops may limit motion to prevent over-cocking or sear overload. Components of the assembly may be configured to remain captive and field serviceable, facilitating maintenance without specialized tools or risk of part loss. A button cap presenting a larger contact area than a strut tip may distribute load to reduce local thumb pressure and provide a broad, nonslip surface(including with gloves), and locating the actuator for a forward directed push motion may improve ergonomics and control relative to rearward pull actions.[01221 Trigger

[0123] In some embodiments, a trigger input member may present two discrete functional faces on a rigid pad or bow. A first, forward / upper face may impart a substantially vertical lift to a forward portion of the sear member, which in turn elevates the sear’s forward pylons to clear a firing pin block (FPB) interface before any release motion is permitted. After that safety clearing lift, a second, rear / lower face may displace the sear along a release path to free the hammer. This sequencing may yield a defined take-up associated with the initial lift, followed by a distinct wall and release as the sear disengages. Reset may occur when the unified sear reperches under shared mainspring bias and the trigger input member returns forward enough for the sear to transition from an intermediate relief shelf back to a primary7engagement surface. Representative pull weights and travels may be tuned by selections of mainspring rate, sear to hammer angles, and lever ratios; optional pretravel and overtravel limiters may be included for fine adjustment but are not required for operation.

[0124] In other embodiments, a straight pull trigger input member may translate along a generally linear path and either (i) act directly on the sear along a release axis to effect release, or (ii) present a two ledge profile in which a forward ramp region engages a forw ard portion of the sear to lift the sear about a guide slot fulcrum (thereby elevating the pylons to clear the FPB) and a rear shelf region engages a release face of the sear to displace the sear rearward along the release axis to free the hammer. With the trigger input member held to the rear, controlled hammer overtravel may cam the sear off the ledge(s) into an off notch (disconnected) state; as the trigger input member returns forward, the sear may reperch via the relief shelf and then the primary7engagement face.

[0125] Safety System

[0126] In various embodiments, a manual, symmetric ambidextrous safety bracket may be mounted transversely through the lower chassis with thumb actuators accessible from both sides. The bracket may rotate between SAFE and FIRE detents and may present visible legends or other indicia on each side to signal status. In SAFE, a blocking surface of the bracket may engage a safety notch on the unified sear to inhibit rearward sear motion and to prevent the trigger input member's lift step from clearing the Firing Pin Block (“FPB’'); the firing pin path thus remains obstructed. In FIRE, a relief window may permit the sear to perform its “lift then release” sequence without interference.

[0127] Firing pin block (optional, but preferred). In some embodiments, an FPB may be included as a passive safety that is cleared during an initial lift phase of the trigger input member; where present, the FPB may be spring biased toward a blocking state and cleared only when a first trigger surface lifts the sear through a prescribed stroke, and it may reengage before the trigger input member fully resets. In straight pull versions, a forw ard ramp region may clear the FPB during an initial portion of linear travel. In all configurations, neither the rear cocking button nor any de-cock mechanism actuates the FPB lifter.

[0128] A mechanical out-of-battery interlock prevents striker or firing pin impact unless the breech is fully in battery. In one embodiment, a slide bome cam shoulder cooperates with a receiver land such that, until the internal slide reaches a defined in-battery position, (i) the sear cannot rotate to a release angle and / or (ii) the firing-pin path remains blocked by the FPB. Only upon full closure do the cam surfaces align to permit both FPB lift and sear release. Equivalent interlocks may be employed.

[0129] In some embodiments, omitting the FPB, drop safety and control may be provided by one or more of: increased sear engagement under acceleration, secondary trigger safety block, or a rearw ard block of the sear that may be co-located with the hammer charging button.

[0130] In combination, the manual blocking geometry, third class lever retention, off notch disconnection during a held trigger input member, lift first FPB sequencing (where present), and positive SAFE / FIRE detents may provide resistance to inertia induced discharge while supporting reliable semiautomatic operation without reliance on a separate slide mounted disconnector.

[0131] De-Cock Feature

[0132] In some embodiments, an ambidextrous de-cock actuator may act on dedicated forward faces of the sear. Depressing either de-cock tab may displace the sear rearw ard sufficiently to release the hammer while the FPB remains engaged, because the de-cock path does not provide the trigger input member’s vertical lift component. The hammer may then rotate to a safe position without contacting an unblocked firing pin. A spring and detent saddle may recenter the de-cock bracket when released so normal trigger input member operation is immediately restored. In representative forms, de-cock travel may be limited by stops, and the actuator does not alter the SAFE / FIRE selector state nor actuate any FPB lift mechanism.

[0133] Integrated Accessory System (IAS):

[0134] In various embodiments, the upper assembly may host an Integrated Accessory' System that combines a modular optics platform (MOP), an integrated power / data bus (IPB), and standardized accessory interface points. The MOP may provide repeatable locating datums and captiveattachment so optics can be removed or serviced without disturbing alignment. A cartridge counter module may be coupled to the IPB and present shot count or state on an onboard or remote display. Additional accessories (such as illumination, ranging, communication, or control modules) may draw power and / or exchange signals through sealed connectors or contact pads. The IAS may support quick disconnect modules and toolless swaps while maintaining environmental sealing and a low external profde.[01351 Cartridge Counter Display

[0136] In various embodiments, a cartridge counting subsystem may include two cooperating modules: a magazine well component and a display component that may be located substantially centered with the bore axis of a firearm. The magazine well component may denve a signal correlated to available cartridges in a detachable magazine and, in some embodiments, chamber presence; the display component may render a user visible indication of cartridges available, including, in some configurations total cartridges in the magazine remaining plus one in the chamber, and optionally export state to other modules. The subsystem may be implemented with mechanical, magnetic, optical, strain, pressure, or other transduction approaches, and the interconnect between modules may be strictly mechanical, strictly electronic, or combinations thereof. Upon magazine insertion, the subsystem may initialize the indicated count to the present magazine and chamber condition based on follower position or equivalent sensing, independent of prior firing history; for example, insertion of a 10 round magazine containing three cartridges may produce an immediate indication of three, and, where provided, a chamber presence input may add a“+l” cumulation.

[0137] Magazine Well Component (Sensing / Indexing)

[0138] The magazine well component may reside in a grip, receiver, or magazine well region and may: (i) couple operatively to a magazine follower or to magazine resident features; (ii) detect changes associated with loading, stripping, or removal; and (iii) produce a monotonic proxy for cartridge count and, where provided, a chamber presence state. The component may include features to debounce motion, tolerate fouling, and avoid impeding magazine insertion / ejection. Interfaces may be standardized so different magazines or adapters can be accommodated without altering the display component. Where an integrated power / data bus is present, the magazine well component may draw power and / or communicate state over that bus; in passive implementations, it may convey state by direct mechanical indexing.

[0139] Display Component (Indication / Interface)

[0140] The display component may be mounted to the upper or rearward frame region and may present a user visible indication of cartridges available and, where provided, a chamber presence cue (e g., magazine only, +1). The indication may be but not limited to numeric, symbolic, or light bar type, and may be readable through a sealed window; in some versions, reflective elements or low power illumination may be used for lowlight legibility. A user interface may be provided for accessing the logic board to adjust parameters of the display module. The display component may accept inputs from the magazine well component via standardized mechanical or electrical interfaces and may, where provided, share state over a system power / data bus to external accessories or a remote indicator. On magazine removal, the indication may blank, show an explicit “magazine out'’ state, or retain the last known value, as configured.

[0141] Interoperation And Behavior

[0142] Upon magazine insertion, the subsystem may initialize or verify the indicated count; during operation it may update indication on follower motion or defined strip / load events. The subsystem may default to a safe / unknown state on fault or power loss and is configured not to affect firing or cycle timing.

[0143] Mechanical Counter Display Embodiment

[0144] In some embodiments, a shot counter assembly may include (i) a count generator that derives a round count from magazine follower motion, (ii) an indicator that presents a user readable numeric value on the firearm, and (iii) a coupling path that advances the indicator by one unit per cartridge dispensed.

[0145] In a mechanical implementation, the count generator may be an indexing mechanism in which a follower coupled bushing translates along a guided slot while constrained against rotation. A helical axle having a spiral groove may be journaled for rotation and axial guidance, and a captured groove pellet within the bushing may ride the groove so that linear follower travel is translated and quantized into proportional axle rotation. The spiral groove may have specific timing that is derived from specific cartridge sizes so that one cartridge movement equals a specific amount of spiral rate.

[0146] The coupling path may carry axle rotation to the indicator via a toothed driver positioned to engage the indicator. The indicator may comprise a flexible numeric ribbon guided along a racew ay so that apertures or windows in the ribbon mesh with the toothed driver teeth and advance one numeral into a viewing window for each calibrated increment of axle rotation. Groove pitch and slot stroke may be chosen so that a defined increment of follower movement corresponds to asingle integer step of ribbon advance across usable follower travel. The axle may also guide a return spring that biases the bushing toward a home / reset position when the magazine is removed.

[0147] A chamber state register may add exactly one step to indicate a “magazine plus one” condition (e.g., a small mechanical flag or offset ribbon tripped once on chamber confirmation) without disturbing the count derived from magazine depletion. In some embodiments, the chamber state register readout may be a separate display ribbon that is nested with the primary display ribbon that has a set of identifiers that are shifted by one unit, as to overlay and replace an initial integer value with the addition of a chamber presence indicator.

[0148] The viewing window may reside at a rear face, tang, or sidewall, provided it remains visible in a normal firing grip. For lowlight legibility, the indicator may be backlit by a tritium vial and / or a low power light source situated behind the ribbon so the active numeral appears bright against an opaque field; where an integrated power / data bus is present, any illumination may draw power through frame pads and spring contacts while the counting function remains entirely nonpowered.

[0149] Packaging may place the helical shaft axle in an angular cavity parallel to the magazine well spin as to preserve a stable mounting distance; anti-rotation features of the lower monocoque grip frame may provide static surfaces where the input follower bushing may linearly travel (e.g., opposed chordal flats) which combined with the follower groove pellet which is in connection with the spiral groove, facilitates rotary translation of linear motion. In some embodiments, towers which contain batteries, or another static structure can be used as an anti-rotation feature for the input follower. Moving elements may be formed from wear resistant polymers, stainless steels, or coated alloys; low friction liners at the slot and journals may reduce hysteresis across temperature and contamination ranges. Because the indexing mechanism engages only a follower transfer feature and does not intrude into the feed path, fouling or counter failure need not impede normal cycling; the arrangement may operate as a passive, shock tolerant mechanical indexer that indicates cartridges available while the firearm remains in a ready state.

[0150] Electronic Shot Counter Embodiment

[0151] In some embodiments a shot counter assembly may likewise include a count generator, a coupling path, and an indicator, where the count generator is realized as an electronic sensor arrangement that derives a round count from follower position and / or cycle events; the coupling path includes a controller that receives sensor inputs, applies normalization / quantization to round boundaries, and updates the indicator; and the indicator is an electronic display viewable on the firearm.

[0152] Representative sensors can include but not limited to a follower mounted magnet sensed by a Hall device, glass scale, NFC, optic sensor, or a brushed contact strip that increments with follower travel, an optical interrupter / reflective arrangement to detect / sense cartridges, or a linear potentiometer; a separate chamber line may furnish a discrete input so that a '‘magazine plus one” condition is presented concurrently with the magazine count. The controller can implement validation (e.g., de-bounced thresholds keyed to follower position with optional gating by a breech / slide state input) so that bounce, partial strokes, or dryfire events are not miscounted. In some embodiments, thermal sensing data may be combined with other sensor data such as chamber status, magazine state, and slide position to detect and warn against squib rounds or other dangerous cartridge issues. Calibration data may be stored so that follower travel maps to integer count across different magazine capacities. The indicator may comprise one or more digital displays such as (but not limited to) seven segment displays, multiple seven segment banks, nixie tubes, LED, OLED, or another display type disposed in a mounting window of the lower grip frame or upper.

[0153] A reset policy can be applied automatically when the magazine is removed (e.g., the controller may detect follower bottom or a magazine absence condition and set the display to zero while preserving a chamber present “+1” when the chamber line is active) so the readout returns to “0” or “1” as appropriate. Powder distribution may be furnished by an integrated powder bus carried by or within the frame, with contact pads and spring contacts supplying the display assembly and controller alongside other accessories; a simple cabling harness can route follower and chamber signals without intruding on the feed path. Packaging may place the display in the frame window with the controller in a protected receiver bay or accessory housing; environmental robustness can be supported by sealed windows, conformal coated boards, and fdtered passthroughs, without constraining the indicator type named above. In the event of power loss, the electronic embodiment can default to a conservative indicator state (e.g., blank or unknown) while leaving feeding and cycling unaffected; upon restoration of power, stored calibration may be used to resume normal indication once follower / chamber signals are re-acquired. In all cases the electronic embodiment may provide a continuous, legible indication of cartridges available and chamber state in a compact form factor, while remaining compatible with a common bus architecture and the same viewing window locations used by the mechanical indicator so that both strategies share user facing ergonomics and sight picture. In some versions, the controller maintains a monotonic time and location base disciplined by an external reference (e.g., GNSS or network time). For each detected shot event, the controller may form a record comprising at least a timestamp and count state and, optionally, location and a biometric state vector sampled within apre / post-event window; records may be stored in write once or tamper evident memory and / or cryptographically signed using a secure element with a monotonic counter. These features are non- critical to firing or cycle timing, and the firearm remains operable without them. A usage / fault monitor may generate alerts including over temperature readings, battery state of charge, and maintenance prompts derived from usage logs; indicators may appear on the firearm display and / or a HUD computer.[01541 Modular Optics Platform

[0155] In some embodiments, a low profile, modular sight and monitoring module may integrate a reflex or bore registered holographic optic with a cartridge count display and interface with an internal power / data bus. A pyramidal frame viewing window may reduce height over bore while preserving internal motion clearance, and controlled window geometry / coatings may reduce glint. The module may nest within, and in some versions, reinforce the lower frame and can optionally serv e as a secondary upper to lower lock. A zero retention quick disconnect interface may permit removal and reinstallation without disturbing alignment and can support upper module or caliber reconfiguration.

[0156] In some embodiments, windage and elevation adjustment mechanisms may be integrated into the integrated counter / display submodule and registered to repeatable locating datums, so optics can be removed or serviced and reinstalled without re-zeroing. The platform may accept alternative optics through standardized interfaces while maintaining the established zero of the submodule.

[0157] The integrated counter / display capability may be realized by a passive mechanical indexer with optional low power or passive illumination and / or by an electronic sensing and display package. Where present, the power and data bus may supply the module and allow cartridge count, chamber state, temperature, or related parameters to be shared with onboard readouts or a remote indicator or heads-up display. Jurisdiction specific ranges or feature sets may be supported via interchangeable submodules while maintaining a common external envelope and mounting scheme.

[0158] Integrated Power Bus

[0159] In some embodiments, a firearm may incorporate a centralized power bus architecture that supplies electrical power to modular features such as optics, illumination devices, aiming systems, cartridge counter displays, and related electronics. Power may be provided by a solar cell for low- power demands such as optics. By consolidating energy storage and routing within the host platform, the system may reduce the burden of managing multiple accessory batteries and mayavoid disturbing precisely zeroed optics during routine battery service. An auxiliary hold-up energy source (e.g., a coin cell or super capacitor) may preserve a real-time clock and state when the primary pack is removed or depleted.

[0160] A representative implementation may house one or more cells within a structural assembly that both encloses the cells and provides discrete conductive paths. One side of each cell may be insulated while the opposite side serves as a feed to the bus. In certain versions, a modular acceptance frame may function as. or carry, a primary positive conductive rail, with selected regions electrically isolated by coatings, masks, or dielectric inserts. Conductors may be realized as embedded wires, plated features, or printed circuit traces formed on or within the frame, permitting power to be routed to the upper assembly and other nodes without external cabling.

[0161] From the centralized source, power may be distributed to an upper escutcheon (e.g., for illumination or aiming modules), to a display or logic board, and to a reflex or holographic sight, while maintaining a minimal external profile because separate accessory battery housings are not required. Interface points may include recessed pads, spring contacts, or sealed micro-connectors. Where provided, a data backbone may share physical pathways with the power bus so sensors and displays can exchange state over the same interfaces.

[0162] The architecture may include basic power management features such as current limiting, reverse polarity protection, and charge monitoring, without constraining attached accessory form factors. Energy7capacity and runtime may be tailored by chemistry, cell count, and duty7cycle; low draw configurations may operate for extended durations from a central pack, whereas higher draw configurations may emphasize rapid recharge via a dedicated port, replaceable packs, or inductive charging. The intent is to furnish shared power for a range of accessones while preserving field serviceability7and a low external profile.Brief Description of the Drawings

[0163] FIG. 1 is a front perspective view of the modular acceptance frame.

[0164] FIG. 2 is a rear perspective view of the modular acceptance frame.

[0165] FIG. 3 is a view of a first step joining the barrel and internal slide via an angled bore.

[0166] FIG. 4 is a view of a second step with the barrel piloting the internal slide.

[0167] FIG. 5 is a view with the barrel rotated into the slide aligned to slide clocking rails.

[0168] FIG. 6 is a view with the barrel translated rearward to engage the rails.

[0169] FIG. 7 is a view of the in battery state with a seated cartridge.

[0170] FIG. 8 is a view of ejection cycle.

[0171] FIG. 9 is an exploded view of the internal slide assembly.

[0172] FIG. 10 is a front section view of a coaxial internal slide and barrel in a modular frame.

[0173] FIG. 11 is a perspective view the pivot block binary recoil assembly engaged.

[0174] FIG. 12 is a perspective view the pivot block binary recoil assembly disengaged.

[0175] FIG. 13 is a view of a bypass state of the BRA showing the internal slide assembly.

[0176] FIG. 14 is a view of a engaged state of the BRA showing the internal slide assembly.

[0177] FIG. 15 is a sectional isometric of the engaged condition with the BRA cylinder.

[0178] FIG. 16 is a view of an upper assembly in a disengaged condition.

[0179] FIG. 17 is a view of a transition toward the engaged condition.

[0180] FIG. 18 is an isolated view of the pivot block ready to admitting the recoil guide.

[0181] FIG. 19 is an isolated view of the pivot block seated against the guide flange.

[0182] FIG. 20 is a view of a lower trigger group and de-cocking bracket.

[0183] FIG. 21 is an isometric of a firing control group with a rear charging button.

[0184] FIG. 22 is a view of a FCG at rest with hammer and sear disengaged.

[0185] FIG. 23 is a view of a FCG in a safety disengagement state.

[0186] FIG. 24 is a view of a FCG after release showing the hammer deenergizing.

[0187] FIG. 25 is a view of the FCG where slide induced overtravel completes disconnection.

[0188] FIG. 26 is a side profile of a locked, ready to fire condition.

[0189] FIG. 27 is a side profile of a disconnection condition where slide motion lifts the sear.

[0190] FIG. 28 is a sectional assembly view of a cartridge feed source and operating system.

[0191] FIG. 29 is a view with the safety bracket raised into the sear safety notch to block sear.

[0192] FIG. 30 is a view with the safety bracket disengaged from the sear safety notch.

[0193] FIG. 31 is a view of paired mirror image magazine release levers coupled by a bracket.

[0194] FIG. 32 is an exploded view of the bilateral release.

[0195] FIG. 33 is a view of a lower grip frame with a magazine well and lower SCM assembly.

[0196] FIG. 34 is a view of a shot counter mechanism transferring motion to the display ribbon.

[0197] FIG. 35 is a cross-section showing an electronic shot counter embodiment.

[0198] FIG. 36 is a view of a shot counter module frame with a cog keyed to a helical axle.

[0199] FIG. 37 is an isometric sectional view of a shot counter assembly in a firearm.

[0200] FIG. 38 is a rear perspective of an integrated display and red dot sight.

[0201] FIG. 39 is a side elevation with elevation and windage mechanisms and bus terminals.

[0202] FIG. 40 is a view of a control board with sensors and interface connectors.

[0203] FIG. 41 is a sectional isometric view of an electronic display assembly and interfaces.

[0204] FIG. 42 is a rear view of Situational Representation SITREP data feeds from a firearm.

[0205] FIG. 43 is a view of a user mounted HUD with display, onboard computer, and harness.

[0206] FIG. 44 is a view of HUD displays presenting situational awareness data from a firearm.

[0207] FIG. 45 is a view of a firearm transmitting live data to a HUD and network link.

[0208] FIG. 46 is a cutaway of an integrated display and red dot sight showing the light path.

[0209] FIG. 47 is an isometric cross-sectional view of the module with display assembly.

[0210] FIG. 48 is a detail of an adjustment group and adjustment assembly.

[0211] FIG. 49 is a cross-sectional view of an integrated display and optic.

[0212] FIG. 50 is a top view of an integrated display and optic.

[0213] FIG. 51 is a cross-sectional isometric view of adjustment mechanism controls.

[0214] FIG. 52 is a view of a firearm assembly with a display module and integrated optic.

[0215] FIG. 53 is a cross-section of an optic and floating conic bushing to align a laser projection.

[0216] FIG. 54 is a view of an firearm with optional accessory optic and a mounting interface.

[0217] FIG. 55 is a view of an assembly with an accessory red dot sight mating to firearm.

[0218] FIG. 56 is a view of an assembled firearm with holographic sight and display.

[0219] FIG. 57 is a view of a firearm with quick detach accessories powered by a modular bus.

[0220] FIG. 58 is a view of an accessory’ mount piloted and rotated into a tapered dovetail.

[0221] FIG. 59 is a view of an accessory’ rotated to a seated position and capturing the optic.

[0222] FIG. 60 is a rear isometric of a host showing a registration bore contact pads and lock pin.

[0223] FIG. 61 is a view of a front escutcheon, power selector, and locking bar.

[0224] FIG. 62 is an isometric view of upper assembly showing, locking bar, curved rear surface.

[0225] FIG. 63 is an isometric view of upper assembly mounted to an external host (drone).

[0226] FIG. 64 is a view of a dock body yvith inductive charging capability.

[0227] FIG. 65 is an exploded view of a modular suppressor front module.

[0228] FIG. 66 is an isometric view showing the modular suppressor installed on the firearm.

[0229] FIG. 67 is a cross-sectional view of the internal slide.Detailed Description

[0230] Referring to Fig. 1 , in some embodiments an upper assembly includes a modular acceptance frame (45) with a prime bore (251) and a secondary cavity beneath a substantially cylindrical tube (78). Loyver sidewalls (258) are pierced with a pivot block pivot hole (218) located about the middle and a rear hammer pivot hole (255) configured to receive a hammer axle and a sear pivot pin. The loyver side of the modular acceptance frame includes a formed lock pin boss (256) provided to secure a locking system. Cylinder BRA recoil walls (101) formed near the middle provide a static barrier for force reaction. The pivot block pivot hole (218) may serve as a datum to locate a barrel mounting hole, and the rear hammer pivot hole (255) may act as a datum for hammer pivot. A cam slot (64) guides a charging pin during a charging stroke. A cartridge ejection window (252) is provided on the frame. One or more sear safety disengagement pylon yvindoyvs (253) extend generally parallel to the bore. An ejector timing slot (254) may be disposed along one or more sides of the frame to receive an ejector and to provide resistance and clearance at different intervals of the cyclic action. At the rear of the frame, a frame fixed reaction face (389) may provide a structure for a sear biasing yvasher (123) to react mainspring load from the hammer spring (122). Adjacent to the reaction face, a hammer thrust strut guide opening (390) receives and pilots the thrust strut (117); in some versions the opening is substantially perpendicular to the bore axis and may include a bushing or insert. The frame can further include contact pads (194) configured to carry electrical po ver and or data.

[0231] Referring to Fig. 2. A substantially cylindrical top tube portion of the modular acceptance frame (45) may serve as a linear guide for a charging handle assembly. The modular acceptance frame includes a prime bore (251 ) and a cartridge ej ection window (252) sized to facilitate ej ection. One or more sear safety disengagement pylon windows (253) extend generally parallel to the bore. An ejector timing slot (254) is disposed along a side of the frame to receive an ejector and to provide resistance and clearance at different intervals of the cyclic action. A hammer pivot pin hole (255) locates the hammer pivot. A formed lock pin boss (256) is provided to secure a locking system. A magazine acceptance opening (257) and lower walls (258) are shown in this view.

[0232] Referring to Fig. 3. In a first step (200) of joining a barrel (65) with an internal slide (59), an angled bore of the internal slide (195) may be formed and sized slightly larger than the barrel. In some examples the bore is cut at about 20°. Barrel clocking rails receiver (196) is provided to accept a mating feature on the internal slide (199). Where the angled bore (195) intersects an internal bore of the internal slide (197), an enlarged throat formed from the angled bore (198) may be defined. The throat may be sized to pass the front distal end of the barrel (65) so that, when the breech side portion is rotated upward, the barrel is ready to enter the angled bore, and then can be pivoted into and translated along the internal bore of the internal slide (59).

[0233] Referring to Fig. 4. A second step (201) may include piloting the barrel (65) along the angle bore of the internal slide with the barrel angularly aligned until a rear portion of the barrel approaches an internal slide recoil surface. As the rear portion of the barrel (65) rotates upward to align with the internal bore (197) of the slide (59), the clocking rail receivers (196) move into alignment and engage by entering the clearance created by the enlarged throat (198), which is defined by the angled bore (195) that guides the distal end. This prepares the assembly for subsequent rearward translation to the seated in battery position.

[0234] Referring to Fig. 5. In some embodiments the barrel (65) is rotated upward (202)into the internal bore of the internal slide (59) so the recoil side portion aligns at the entrance and can pivot fully into the bore. At this orientation, clocking rail receiver ( 196) surfaces on the barrel are brought into linear alignment with clocking rails (199) of the internal slide, positioning the parts for engagement during the subsequent rearward motion.

[0235] Referring to Fig. 6. The barrel (65) is translated rearward (203) direction within the internal slide (59) until the clocking rail receiver (196) engages the formed clocking rails (199) of the internal slide. In this state the barrel may be moved to the aft limit within the internal slide, the rails restrict relative motion about the bore axis of the barrel and maintain coaxial alignment while constraining withdrawal with the assembly seated for in battery operation.

[0236] Referring to Fig. 7, which describes the in battery position (204). A cartridge (206) may be shown seated within the barrel (65), with an extractor (207) positively biased into engagement with the cartridge rim and holding the case against the breech face. A safety pin (154) disposed transversely within the internal slide (59) can intersect an ejector pocket (230) so that a shaped ejector stop (209) on an ejector is retained within the pocket; for example, a breech side concave on the stop may seat against a chordal underside of the safety pin (154) to inhibit escape from the pocket. In representative constructions the ejector pocket (230) may include a substantially cylindrical bore opening through the breech face to admit a front cylindrical portion of the ejector when actuated, together with a vertically elongated slot contiguous with the cylindrical portion; a transverse passage (211) for the safety pin can eclipse a portion of that slot to establish a retention shoulder. An ejector return spring may bias the ejector rearward so that, in the absence of actuation, the ejector does not protrude at the breech face (213) and does not interfere with stripping and feeding a new cartridge into the chamber. In this view the barrel (65) and internal slide (59) are shown in the in-battery position. The rear portion of the internal slide (59) may include a charging pin (63) disposed within a slot.

[0237] Referring to Fig. 8. During the ejection cycle (205) a cartridge (206) is withdrawn from the chamber of the barrel (65) by the extractor (207) as the internal slide (59) travels rearward. The ejector (208) slides within a modular acceptance frame ejector timing slot (254) until the ejector (208) abuts a distal end of said frame ejector timing slot (254), at which point relative motion between the slide and the frame urges the ejector forward slightly. As the ejector moves forward, a front cylindrical portion projects through the breech face and contacts a lower region of the case head, preferably below the cartridge axis centerline and generally opposite the extractor, to generate a moment that kicks the case laterally out of the w eapon.

[0238] Charging pin relationships (general). In some embodiments a charging pin (63) may reside within a charging pin slot (234) of the internal slide (59). The pin can be positioned so that it is isolated from the extractor (207), which may itself be retained by a safety pin (154). The same safety pin can also provide positional retention for an ejector (208), an ejector return spring (224), an ejector spring follower pin (226), and afiring pin (159) together with its firing pin spring (160), thereby establishing a compact set of interlocking restraints without loose microparts.

[0239] Referring to Fig. 9. An exploded diagram may show the barrel (65) and the internal slide (59) as parts of an internal slide assembly (227), the components being separated to illustrate how they cooperate when assembled. A safety pin (154) is arranged to pass through safety pin ears (216) and a safety pin passage (211) and to traverse an extractor cavity (233) so as to retain the extractor (207) and extractor spring (210). A charging pin slot (234) is provided to guide an internal slidecharging pin (63) so as to couple a charging handle. A firing pin (159) may be provided with a firing pin spring (160) that is seated to positively bias the firing pin away from the breech; a firing pin rear stop (228) is positioned to limit rear travel and a firing pin front relief (229) is positioned to receive the safety pin so as to block forward travel when placed in safe. An ejector (208) bears an ej ector stop (209) that is positioned to engage a rear face of a frame slot so as to prevent rearward escape; an ejector spring (224) is captured on the ejector by a spring follower pin (226). and in some builds a second ejector spring (224) may be installed in the same location to increase preload. A firing pin cavity (232) is provided to intersect the safety pin passage (211) so as to allow the safety pin to cooperate with the firing pin while preserving clearance for the charging pin travel.

[0240] Referring to Fig. 10. A front section view may depict a coaxial internal slide assembly received in a modular acceptance frame (45). The internal slide (59) houses a barrel (65) with a clocking rail receivers (196) engaged to the clocking rails (199) of the internal slide. At the rear, the slide may carry a firing pin (159) near the bore axis and present an extractor (207) and an ejector (208) at a cartridge recess (217) of the breech face, positioned to interact with a cartridge. A charging handle (60) can embrace the upper circumference of the frame and seat within the lower grip frame (1); a trigger pad (135) may be visible in section below. The front opening of the slide where the front retaining lip and recoil surface (66) is located may have a minor diameter substantially equal to the diameter of the barrel, and smaller than the barrel monoblock maximum transverse dimension, thereby precluding axial passage of the monoblock in service. The entry throat is obliquely oriented and contiguous with the primary bore to accommodate oblique insertion and pivoting of the monoblock during assembly.

[0241] Referring to Fig. 11 (Pivot Block BRA, Bypass). An assembled firearm may be shown with a Pivot Block-style Binary Recoil Assembly in a Bypass (charge assist) state (51). A pivot block (53) may be biased downward away from the bore axis so that tabs or ears (46) are located in lower portions of the arched frame slots of the modular acceptance frame (45). A charging handle (44) may include a lower cam surface (47) by which, when the charging handle is drawn rearward, the tabs are urged downward and the BRA is placed on the Bypass path (51) so that the primary recoil spring is decoupled from the load path. Dimension (50) illustrates lost motion that may be required to place the BRA into the Bypass state before contact is made between rear faces of the charging handle (44) and a charging handle pin that resides at a rear region of the internal slide. For clarity, certain internal members may be omitted in this view.

[0242] Referring to Fig. 12 (Pivot Block BRA, Engaged). An assembled firearm may be shown with a Pivot Block style Binary Recoil Assembly in an Engaged state (49). In this condition a pivot block is biased upward toward the bore axis so that tabs or ears (46) sit near the upper ends of theirarched frame slots in the modular acceptance frame (45). A pivot block variant charging handle (44) carries a lower cam surface (47) arranged so that, when drawn rearward, the cam urges the tabs downward to transition the BRA to a Bypass (charge assist) path that decouples the primary recoil spring from the load path. For clarity, certain internal members may be omitted in this view.

[0243] Referring to Fig. 13 (Cam Cylinder BRA, Bypass). A view of the firearm in a Bypass (charge assist) state (69) may show the internal slide (59) positioned within the modular acceptance frame (45). An optional frame guide slot (67) may extend through a lower cylinder guide (68) such that a lower internal slide recoil surface (66) is received within the lower cylinder guide (68). A recoil spring guide (71) may be carried in a bore of the recoil surface (66) to support a primary recoil spring (70), and may be retained by a guide retention pin passing through a retention slot of the frame. A clearance gap (99) may admit a cam cylinder charging handle (60) cam pin (61) that registers in a BRA cylinder cam track, allowing relative motion during charging. The rear side of the charging handle (60) may include a rear pushing surface (62) to push on an internal slide charging pin (63) tow ard a rear portion of the modular acceptance frame (45), which may include a cam slot (64) that causes a cam surface to disconnect the charging handle and release the internal slide. In the Bypass state, the primary recoil spring is decoupled from the load path, and the spline or other alignment pattern of the BRA cylinder is in-phase with a complementary pattern on the recoil spring guide so that the guide slides within the cylinder without compressing the primary recoil spring, allowing a spring coupled to the internal slide to move linearly.

[0244] Referring to Fig. 14 (Cam Cylinder BRA, Engaged). A complementary view may show the firearm in an Engaged state (72) in which the internal slide (59) has rotated the BRA cylinder (77) within the lower cylinder guide (68) to a coupling orientation. In this condition, the recoil spring guide (71) is engaged with the BRA cylinder (77) so that translation of the guide compresses the primary recoil spring (70), adding recoil resistance. Any auxiliary return spring, if present, may be relieved or inactive. In the Engaged state, the spline or other pattern is out-of-phase with the recoil spring guide, preventing free sliding; the primary recoil spring is in the load path for firing.

[0245] Referring to Fig. 15 (Cam Cylinder BRA, Engaged; sectional isometric). A sectional isometric view7may duplicate the condition shown in Fig. 14 to illustrate internal relationships. The internal slide (59) is positioned within the modular acceptance frame (45). A barrel (65) is fixed to the modular acceptance frame (45), for example by a pin (48). A BRA cylinder (77) is shown with an internal spline (85) visible in section; in the Engaged state the cylinder’s internal spline is oriented out-of-phase with a complementary pattern on the recoil spring guide (71) such that translation of the guide compresses the primary' recoil spring (70), and the primary recoil spring is in the load path. A lower internal slide recoil surface (66) locates the guide so that the primaryrecoil spring (70) and guide rod are supported, while a secondary return spring (73) may be arranged near a forward barrel extension (74). A charging handle (60) is shown for context. An Engaged state indicator (72) may be included to identify the state.

[0246] Referring to Fig. 16 (Cam Cylinder BRA, Bypass; Upper Assembly Only). An exemplary view of the upper assembly is show n without the lower frame to clarify internal relationships. The view corresponds to the Bypass (charge assist) state (69) in which the primary recoil spring is decoupled from the load path. Components may be omitted for clarity.

[0247] Referring to Fig. 17 (Cam Cylinder BRA, Engaged; Upper Assembly Only). An exemplary view of the upper assembly is shown without the lower frame to clarify internal relationships. The view corresponds to the Engaged state (72) in which the primary recoil spring is in the load path. Components may be omitted for clarity.

[0248] Referring to Fig. 18 (Pivot Block BRA, Bypass). An isolated view of the pivot block (53) is shown in a Bypass (charge assist) state. Pressure applied at the tops of the pivot block ears (46) may rotate the block about a pivot pin (48) so that the block dips away from the guide path, allowing a recoil spring guide (71) to translate within an internal relief (91) w hile the primary recoil spring (70) remains uncompressed. A recoil face (94) on the pivot block is visible in this orientation. A pivot block tongue (95) may register adjacent to a recoil spring guide hexalobular flange (90).

[0249] Referring to Fig. 19 (Pivot Block BRA, Engaged). An isolated view- shows the pivot block (53) in an Engaged state. The block is rotated about a pivot pin (48) so that a recoil face (94) seats against a recoil spring guide hexalobular flange (90). The pivot pin (48) may be positioned in line with, or below, the thrust axis of the recoil spring guide (71) load path so that the block tends to lock under load rather than release. With this contact established, the recoil spring guide (71) is admitted and the primary' recoil spring (70) is compressed, while entry into the internal relief (91) is blocked. Pivot block ears (46) are in their engaged orientation, and a pivot block tongue (95) may register against the guide region.

[0250] Referring to Fig. 20 (Trigger Input Member And DeCock Assembly. Frame Omitted). With the lower grip frame or support structure omitted for clarity, a de-cocking bracket (141) may be shown secured by securement ears (144). The bracket may carry a de-cocking tab (147) arranged to pivot relative to fastening rivet (145). Opposed ears of the bracket may support a trigger input member (137) on trigger input member pivot axles (138) so that a trigger pad (135) can pivot within the bracket (141). The de-cocking tab may include engagement surfaces (147) arranged to act on the sear to move the sear rearward during a de-cock event. A centering dart pin hole (142) on thebracket may be shown to provide the centering dart pin guide. Decocking butons (259) may be exposed outside of the lower grip frame or support structure for convenient access.

[0251] Referring to Fig. 21 (FCG charging by rear buton), an isolated isometric view of a firing control group may show a hammer charging buton (121). An inside cavity of the charging buton (171), bounded in part by an overhanging wall (172), may form a shell-like cavity that defines a vertical wall which, when pushed, applies direct pressure to the rear face of the hammer thrust strut (117). This allows energy to be applied to cock the hammer to an energized position. Progression may continue until the curved hammer surface (113) displaces the sear rearward and aligns the rear portion of the sear with the hammer’s sear-receiving cavity (175), so that the sear is captured under bias from a hammer spring (122), which stores energy' to drive the hammer. Optional hammer charging buton springs (170) may also be provided. Trigger engagement pads (110) may be positioned to cooperate with a trigger sear engagement relief shelf (140) and a trigger sear relief shelf (139) during a later disconnection event. The sear may pivot within a sear pivot slot (108). A safety bracket (124) may pivot on a safety' bracket pin (125). State indicators such as unlocked (126), safety off (130), and charging button disengaged (132) may be shown for context, and decocking faces (111) may be identified for interaction during a de-cock operation.

[0252] Referring to Fig. 22 (Firing Control Group in its "At Rest Position”). A firing control group may be shown in a rest position (169) at an initial portion of its cycle, where a sear (105) is disengaged from a hammer (112). The hammer (112) may pivot on a hammer axle (116) that may also be shared by the sear (105) which may be provided sear pylons (104) and said sear may operate within a pivot slot (108). The hammer may include a tongue (386) arranged to receive a front side forked opening of a hammer thrust strut (117). The hammer thrust strut (1 17) may be coupled to the hammer (112) with a thrust strut pin (387). The assembly may be in a relaxed initial state, with a hammer spring (122) un- tensioned and a hammer thrust strut (117) free of applied drive. A sear biasing washer (123) may act against a reaction surface of a modular acceptance frame to provide direct spring force for sear reset, or to share spring force derived from the primary hammer spring (122). In this position, charging may occur by applying pressure to a rear region of the hammer thrust strut (117), by using a charging handle (60 or 44) to manually cycle the internal slide to chamber a new cartridge, or by intentional cycling of the action while a cartridge has been fired. A lockup domain (168) may be indicated as a region in which spring force is directed into the trigger path, and a disconnection domain (167) may be indicated as a region approached during a trigger induced release.

[0253] Referring to Fig. 23 (Safety Pin Disengagement). A firing control group may be shown about the midpoint of its curvilinear cycle during a safety pin disengagement event (155). In thiscondition the hammer (112) and a hammer thrust strut (117) may be fully energized by a hammer spring (122). which biases the thrust strut away from the hammer. The sear (105) may engage a lock cavity (175) on the hammer so that a locked by sear engagement state (120) is established. Sear pylons (104) may act against lower ears of a safety pin (154) (not visible in this view) so that a firing pin passageway is temporarily opened in preparation for firing.

[0254] Referring to Fig. 24 (post fired, de energization transition). After a deliberate trigger pull towards a release state (128), the firing control group may be shown passing through a de energization region (163). A sear (105) may have been cammed rearward and moved clear of a hammer (112) sear engagement surface (113) so that the sear engagement is released from sear surface (388). The sear may pivot about a pivot axle (116) within a pivot slot (108) while sear pylons (104) are indicated forward of the pivot. A center hammer thrust strut (117) with a thrust strut head (118) may be shown advancing along its path as stored energy is delivered. A sear biasing washer (123) may act to return the sear toward a forw ard position for reset.

[0255] Referring to Fig. 25 (disconnection phase). A firing control group may be shown in a final portion of its cycle (152) in which a disconnection event is produced. During firing or charging induced rearward motion of the internal slide, a lower cam surface or relief may cause a hammer (112) to move beyond a lock position limit (164) and into a disconnection domain (167) so that an upper face of the hammer cavity (175) presses on a top region of the sear (105). This action raises aforward portion of the sear about a sear pivot axle (116) within a pivot slot (108). As the relative motion continues, a center hammer thrust strut (117) with thrust strut head (118) may advance under stored energy while a sear biasing washer (123) maintains a forward return bias on the sear. The geometry corresponds to entry into the disconnection domain (167) at a defined angle of disconnection deflection (165), by which the sear is lifted out of the trigger path to complete disconnection.

[0256] Referring to Fig. 26 (FCG ready profile). A side profile may illustrate a firing control group in a locked, ready to fire condition (155). An internal slide (59) may be shown for context. A sear (105) may engage a hammer ( 112) in a locked by sear engagement state (120), with a lower sear face (107) indicated while sear pylons (104) have disengaged the firing pin block (154). A sear biasing w asher (123) may be in connection with a modular acceptance frame offering a reaction face for the hammer spring (122). A hammer thrust strut (117) may be aligned under load from a hammer spring (122), while a hammer charging button (121) may be shown in a ready to charge state.

[0257] Referring to Fig. 27 (FCG disconnection). A side profde may depict a disconnection phase (151) in which a disconnection condition (152) is established by withdrawal of the sear (105) from atrigger sear engagement shelf (139) on atrigger pad (135). Rearward motion of the internal slide (59) may urge the hammer (112) slightly past its normal lock angle so that the trigger path is lifted clear and the hammer begins a re-mode for the next cycle. The hammer may be biased by a hammer spring (122) and supported to rotate about a pivot axle (116). Ahammer charging button (121) may be shown to indicate the charging interface used to complete the re mode as the mechanism returns. A de-cocking group (150) may be included for reference in this view.

[0258] Referring to Fig. 28 (Isometric View Of Breech Components With Internal Slide In Cross Section). A partially assembled firearm (225) may be shown with an internal slide (59) in section and a magazine assembly (16) presenting a cartridge (206) to be stripped at the lower region of the slide. An ejector (219) may be depicted with an ejector spring (224) and a follower pin (226) arranged so that the assembly is biased toward a safety pin (154) and bears against safety pin ears (216). Afiring pin (159) may be positioned between the ejector region and the extractor region. An extractor (207) may be shown with an extractor spring (210) biasing the extractor toward the cartridge rim. An internal slide charging pin (63) may be received in a rear slot (212) of the slide to allow vertical compliance during operation. An angled bore (195) of the slide may be visible in this sectional view. Components not required for this depiction may be omitted for clarity and are shown in other figures.

[0259] Referring to Fig. 29 (Internal View SAFE). With the lower grip frame removed or shown in phantom, a Safety On condition (129) may be illustrated in which the safety bracket (124) is raised into the sear safety notch (109), thereby inhibiting rearward motion of the sear (105).

[0260] Referring to Fig. 30 (Internal View FIRE / Safety Off). A second view complementary to Fig. 65 may show the safety bracket (124) disengaged (130) from the sear (105) safety notch (109) thereby permitting rearward motion of the sear during normal trigger input member operation.

[0261] Referring to Fig. 31 (Bilaterally Symmetric Magazine Release Assembly). A pair of mirror image release levers (241) may be provided, each carrying a lever hub (245) that pilots in opposed entry bores of the grip frame to serve as a pivot. A biasing spring (243) may be seated betw een the levers in a central window^ so the levers are urged outward to a rest position. With the levers depressed to an installation position, a coupling bracket (242) may be inserted between the levers so that a saddle region engages the hubs and ties the levers together for synchronous motion while controlling axial spacing. A magazine catch or release interface (244) may be presented by thecoupled parts so that, in the rest state, the catch is retained and, when either lever is pressed, the interface is withdrawn to release a magazine.

[0262] Referring to Fig. 32 (exploded magazine catch assembly). An isometric exploded view may illustrate relationships among components of a bilaterally symmetric release. Release levers (241) may be arranged on opposite sides with lever hubs (245) presenting opposed hub faces (249). Each hub may include an inner hub groove (247) so that, when assembled, the opposed grooves cooperate to guide a coupling bracket (242). The bracket may present a magazine catch projection (244) that extends to engage a magazine (16). A biasing spring (243) may be seated on a spring seat or retainer feature (246) of the bracket so the assembly is urged toward an engaged state; when either lever (241) is pressed, the bracket may translate within the opposed hub grooves (247) to withdraw the catch projection (244) and release the magazine.

[0263] Referring to Fig. 33. A lower grip frame (1) may define a magazine well (2) that receives a magazine assembly (16). A magazine shell (5) with a magazine baseplate (6) may be shown containing a cartridge (3) and a cartridge follower (8) that carries a follower nose (7). A magazine cutout (4) may be provided for a pivoted slide catch interface. An input follower (11) may be positioned within the firearm adjacent to the magazine well, with a bushing edge (10) presented within the magazine cavity. The input follower may include a bore sized to receive a helical axle (12), with a follower groove pellet (35) presented within the axle receiving bore, and may be energized by a helical axle return spring (13) that biases the input follow er downw ard. A magazine follower nose slot (9) may be depicted for clearance and guidance. A display ribbon (14) may be routed along the magazine and presented at a cartridge display (15) so that cartridge status can be observed when the magazine is installed in the frame.

[0264] Referring to Fig. 34. A lower grip frame (1) may define a magazine well (2), with a magazine baseplate (6) shown at the lower end for context. Adjacent to the well an input follower (11) may be positioned and bored to receive a helical axle (12), the follower being biased by a helical axle return spring (13) toward a rest position. A follower nose (7) and a magazine follower nose slot (9) may be arranged so that motion at the follower nose is transferred to the input follower when a magazine is inserted or withdrawn. A display ribbon (14) may be routed along the frame to present status at a viewing location. An intentional sectional cutout (17) is provided for visibility and clarity, and not required for function.

[0265] Referring to Fig. 35. A mounting window (15) in the lower grip region may receive an electronic display (22). Signals to the display may be carried by a primary display harness (21) from a logic controller (20) positioned within the assembly. A separate cable (19) may be providedto accept a chamber present sensor such as a Hall sensor (18) where used. A magazine follower pedal (26) may cooperate with a sensor (27), for example a linear potentiometer, so that follower position is detected and interpreted by the logic controller (20) to derive cartridges remaining for presentation on the display (22). A power source may be provided such as a battery tube “A” (23) or multiple batteries configured to provide power to the system, in the form of packs or separate tower battery tube “B”. A connector (24) such as a linear potentiometer connector may be utilized to connect the upper display module to the lower magazine well sensing circuitry.

[0266] Referring to Fig. 36. A lower grip frame (1) may receive a shot counter module display assembly (41). An SCM frame (31) may carry a display ribbon (14) that includes display ribbon holes (40). A toothed cog (29) may engage the display ribbon holes and be keyed to a helical axle (12) so that the cog and the axle rotate together to index the ribbon. A return spring (13) may bias an input follower (10) toward a rest position when no magazine is present so the indication returns to a starting value.

[0267] Referring to Fig. 37 (mechanical chamber indication). A shot counter module frame (31) may support a display ribbon (14) that is advanced by a toothed cog (29) keyed to a helical axle (12). An SCM frame cover (32) may be provided to seal the assembly from debris ingress. The assembly may include tritium backlight (33) or related illumination source to backlight said display ribbon in low light situations. Push button cocking button tunnel (42) may reside behind the SCM assembly. The helical axle return spring (13) may move to a shortened compressed state (34) as the input follower (10) moves upwardly within the lower frame. Follower groove pellet (35) may be seen engaging the helical lead of said helical axle (12)

[0268] Referring to Fig. 38 A rear perspective may show an integrated display assembly (41) that co packages a low profile reticle sight. In this view- a substantially pyramidal lens window (324) of an SCM frame (31) may seat a lens (325) that presents a red dot tow ard the user, while a display ribbon remains housed within the same frame. The assembly (329) may also present rear access elements including a windage adjustment socket (323). Power source terminals (366) may be provided for powder from a power bus. An angled tunnel (328) within the housing (31) may direct the light path to the lens (325). A toothed cog (29) may register with display ribbon holes. The SCM housing may include spring loaded mounting pins (327) for securement into a secondary structure such as a lower grip receiver.

[0269] Referring to Fig. 39 (side view of display assembly and integrated optic). The display module may be fixed relative to the firearm (that is, non-reciprocating with the slide) and retained by keyed features such as rails, shoulders, or latches so the slide reciprocates around a pocketedwindow. A side elevation view may depict the assembly isolated from the lower frame, with access to an elevation mechanism (322). Power source terminals (366) may be present on a lower portion of the SCM housing (31). A pyramidal lens housing (324) may be disposed at an upper region of the integrated display and red dot assembly (329), and a toothed cog (29) may be arranged to receive a helical axle. Spring loaded locking pins (327) may be provided to install the assembly into a secondary structure such as a lower grip receiver.

[0270] Referring to Fig. 40 A logic board (20) and assembled logic board circuit assembly (359) may comprise various components such as include RAM (361), a wireless radio transceiver (362), a sensor interface connector (363), a display connector (364), and a graphics ribbon cable (365). Power source terminals (366) and one or more data or bus connectors (367) may couple the board to a firearm power bus and to external sensors. A lower circuit board interface (376) may locate the assembly within an integrated display and red dot sight assembly (329) and communicate with a display assembly (41). In some embodiments, the control board integrates a secure element and write once or tamper evident memory for record retention, and the sensor interface connector may accept biometric inputs and a GNSS transceiver / receiver may record or transmit time base and location data. Radio communication may be provided by a transceiver on the firearm board or by a provided transceiver to integrate with a HUD computer. Likewise, a GNSS receiver may reside on either side; when GNSS is off-gun, the HUD computer can supply time and position over the link. Cryptographic keys used for pairing, signing, or encry ption may be stored in a secure element on either side for authentication. Power and data may be conveyed to a rear module through a compliant conductor or a flexible printed cable.

[0271] Referring to Fig. 41 (Exploded View Of Electronic Display Assembly And Optic). An electronic control board assembly (359) may be shown in alignment with an integrated display and red dot assembly (329) and a display assembly (41). A power module (180) may be positioned to couple with the board and housing. Features sensor array (358) and lower board / assembly (357) may be arranged to locate, seat, and retain the board, the display, and the power module within the assembly.

[0272] Referring to Fig. 42 (RearView Of Integrated Display Assembly). A display assembly (41) may be shown installed to display Situational Representation (SITREP) data feeds from a firearm. The visible interface may present a SAFE or FIRE indicator (353). a warning system indicator (354), cartridges remaining in magazine indicator (355), a barrel temperature indicator (356), a total shots fired indicator (351), and a chamber indicator (352). Within the module a maintenance sensor board status (357) and a battery status level (358) may be arranged to acquire operating data and to drive the indicated readouts, while the assembly remains packaged with the optic. Whenequipped, certain SITREP feeds may be mirrored to a personal wearable such as a Heads Up Display (HUD), or provided in a holographic sight window on the firearm for an embedded HUD system.

[0273] Referring to Fig. 43 (Heads Up Display With Wireless Computer). A heads up display (369) may be supported on a helmet (370) by HUD attachment arms (371) and may present one or more HUD displays (372), and a computer (373) which may provide input output communication feeds between a firearm, user and a network. A power or data harness (374) may route signals and power within the module or to an external source. In some embodiments, networked data feeds may also be displayed from other pistols (375) to provide situational awareness.

[0274] Referring to Fig. 44. One or more HUD displays (372) may present pistol data displayed on HUD (374) together with networked firearm SITREP data from the other users (375). The information may be provided as networked feed information (373) while the displays are supported on HUD attachment arms (371).

[0275] Referring to Fig. 45 (Firearm To HUD And Network Communication). A firearm assembly (180) equipped with a display assembly (41) may provide status and sensor information through networked data (375) to a computer (373) that may provide netw orked feed information (377). The feed may be transmitted as live data (384) for presentation on a heads up display (369) and its HUD displays (372), and may also be relayed to external systems for situational awareness. A network (378) may exchange data between other equipped firearms and reciprocally transmit data betw een users. When a time reference is available, for example GNSS or network time, shot events may be associated with time stamps and, where paired sensors are present, biometric state sampled within a defined bracketing window; secured records may be exported for after action review or forensic use. When external references are unavailable, a local oscillator may provide relative timing with later reconciliation. Collection of biometric or location data may be disabled by user setting or policy. The link between the firearm and the HUD computer may be wired, for example UART, USB. CAN, or a differential serial link, or wireless, for example Bluetooth Low Energy. Wi Fi, ultra wideband, or sub GHz. Sessions may be authenticated using pre shared keys or certificates, and messages may include integrity protection with an authenticated encryption mode. Either side may originate SITREP records; when both are present, records may be merged or reconciled.

[0276] Referring to Fig. 46. A cutaway view of an integrated display and red dot sight assembly (329) may be shown with a pyramidal lens window (324) presented toward the user. An angled tunnel (328) within the housing may route light from a light source carrier (330) that is received in a light source housing (332). A cyclops lens (334) may be arranged to enlarge characters formedon a display ribbon (14), the ribbon including display ribbon holes (40) for indexing within the module. A threaded plug (338) may register with the housing to retain and set preload in the adjustment stack.

[0277] Referring to Fig. 47. An SCM frame (31) within an integrated display and red dot sight assembly (329) may be shown supporting a display assembly (41). Light may be projected to a pyramidal lens window (324). SCM lock pins (327) may be provided to seat the module in a receiving structure. The ribbon path may include display ribbon holes (40) for engagement with the drive. A windage adjustment screw (336) may act on a light source carrier (330), while an elevation detent pin (346) may cooperate with elevation flange detents (342) and a threaded plug (338) to establish repeatable adjustment with controlled endplay.

[0278] Referring to Fig. 48. An adjustment group for an integrated display and optic may be shown. A light source carrier (330) may be received in a light source housing (332). with a windage adjustment screw (336) arranged to act on the carrier. An elevation interface may include members (341) and (340) that cooperate with elevation flange detents (342) and a threaded plug (338) to establish repeatable settings and controlled endplay. Splined shaft (331) provides relative positioning and allows for a sliding fit for adjustment. Elevation spline shaft flange (339) is provided as a detent guide for precise adjustment. A harness (343) may route power and data to a display ribbon (14), while a sealed SCM frame cover (32) and a purge port (333) may be provided for environmental control and service access.

[0279] Referring to Fig. 49. An integrated display and red dot sight assembly (329) may be shown with an SCM frame (31 ). A lens (325) may be seated while an angled tunnel (328) routes light from a light source carrier (330) toward a mirror (335) and through the lens. A cyclops lens (334) may be arranged to enlarge characters formed on a display ribbon (14). The ribbon may be indexed by a toothed cog (29) that rides on a bearing surface (337) within the frame (31). A tritium backlight (33) may illuminate the ribbon. Power source terminals (366) may be provided on the housing, a purge port (333) may be present for environmental control, and a harness (343) may route power or data to the module.

[0280] Referring to Fig. 50. An integrated display and red dot sight assembly (329) may be shown with a display assembly (41) installed behind a pyramidal lens window (324). Spring loaded mounting pins (327) may be arranged to seat the assembly in a receiving structure.

[0281] Referring to Fig. 51. An integrated display and red dot sight assembly (329) may be shown with splined shaft (331) and elevation spline shaft flange (339). Cyclops lens (334), may be placed for reference.

[0282] Referring to Fig. 52 (Assembled Firearm With Integrated Display And Optic). An assembly (180) with front modular escutcheon (193) may be shown with a display assembly (41) installed together with an integrated red dot sight (177). The display assembly may seat in a chassis such as the lower monocoque grip frame (1).

[0283] Referring to Fig. 53 (Cross Sectional View Of Holographic Sight Embodiment). A firearm assembly (180) with front modular escutcheon (193) and integrated optic may be shown. A floating conic bushing (379) may be mounted on a floating bracket so that compliance and degrees of freedom are provided. When an upper having a modular acceptance frame (45) is seated to a lower, the conic bushing may self center relative to a feature that is coaxial with the bore axis (295). A laser source (378) carried within the conic bushing may emit rearwardly into the optic, the beam being directed to a first mirror (380), routed through a diffractive grating, and then directed to a second mirror (381) that projects toward a lens (325) to form a viewable image (382). This arrangement may maintain alignment of the projection with the bore axis as the bushing centers during assembly.

[0284] Referring to Fig. 54. An assembly (180) may be shown with an integrated red dot sight (177). Amounting interface (348) may be arranged to seat the sight on the assembly and to establish alignment and retention, with the view indicating the orientation of the sight relative to the assembly during installation and service.

[0285] Referring to Fig. 55. An assembly (180) may be shown together with an integrated red dot sight (177) and an integrated display and red dot assembly (329). A mounting interface (348) may be arranged to seat the sight on the assembly. Mounting screws (350) may register the sight to the adapter assembly and to the display module so that position and orientation are maintained while allowing service removal. A battery interface coupler (349) may transfer power from the integrated pow er bus of the firearm to simulate a specific size and shape of the battery7in w hich the desired optic requires to operate. This provides a system to mount an optic, without having to remove to replace batteries, as the power source for the firearm is more readily accessible elsewhere on the firearm.

[0286] Referring to Fig. 56. An assembled firearm (180) may have an integrated holographic or red dot sight (177) may be shown co packaged with a display assembly (41). A pyramidal lens window (324) may seat a lens (325) that presents the aiming dot to ard the user, while the display assembly operates within the same module. In this view live data (377) may be indicated as information provided by the display assembly during operation.

[0287] Referring to Fig. 57. An assembly (180) may be shown mounted to a lower grip frame (1) and a front escutcheon ( 193) with a modular acceptance frame (45). The chassis system is provided as a platform to configure and mount accessories to. An integrated red dot sight (177) may be carried on an accessory mount (179) that couples by a quick detach interface (181). Forward and aft accessory modules (178) and (181) may be arranged to connect to a common power bus provided through the modular acceptance frame (45), and an electronic shot counter SCM assembly (28) may likewise connect to the bus. In representative constructions the bus presents contact points at defined regions so accessories can be installed or removed by the quick detach interface (181) without external cabling.

[0288] Referring to Fig. 58 (Accessory Registration And Rotary Dovetail). An assembly (180) may be shown with a lower grip frame (1). a front escutcheon (193), and a modular acceptance frame (45). An accessory mount (179) may be installed by piloting a registration boss (189) into a registration bore (183) of the lower grip frame. Engagement may guide the mount into curved, slightly tapered rotary dovetail tracks so that male rotary' dovetails (179) enter female receiver slots as the mount is rotated into position (184). A lock pin (178), urged by a spring (187), may be depressed by a leading edge of the accessory mount (179) during rotation and, at the seated position, may snap into a lock pin receiver ( 182) to inhibit reverse rotation and provide repeatable seating. Atop deck (185) may be indicated to confirm final alignment at the escutcheon.

[0289] Referring to Fig. 59 (rotation into lock). An assembly (180) may be shown with a lower grip frame (1), a front escutcheon (193). and a modular acceptance frame (45) while an accessory mount (179) carrying an integrated red dot sight (177) is rotated into its seated position. As rotation proceeds, a lower face of the accessory' aligns with atop deck (1 5) and male rotary dovetails (179) are guided into female receiver slots of the sight to form a repeatable locating interface (186). At the seated position a lock pin (178) may enter a lock pin receiver (182) to complete installation. An SCM assembly (28) may be shown for context.

[0290] Referring to Fig. 60 (host, no accessory’ installed). An isometric rear view may depict a assembled firearm (180) with no accessory’ ( 192) installed. A front escutcheon (193) and a modular acceptance frame (45) may be exposed above a lower grip frame (1), with a registration bore (183) presented at the top deck (185) for subsequent installation of an accessory mount (179). Contact pads (194) may be visible to provide power and. where used, data to an installed accessory. An accessory' lock pin (178) may be positioned to engage a mating receiver during installation. An SCM assembly (28) may be shown for context.

[0291] Referring to Fig. 61. A front escutcheon (193) may be shown with a curved rear surface (315) that cooperates with an overhanging charging handle (60 / 44) to help maintain assembly integrity during recoil cycles. The escutcheon may include an integrated locking bar (316) that carries spring loaded protrusions (317) arranged to engage locking windows of a lower frame so the escutcheon seats repeatably. A lower cavity (318) may be formed to accept an accessory or a secondary utility bay, and a selector switch (319) may be provided to route power from a source to destinations within the firearm such as a forward accessory and a rear display or optic.

[0292] Referring to Fig. 62. Ahost view may depict an firearm absent state so that interface features of the front module are visible. An integrated locking bar (316) on the escutcheon may be shown together with its spring loaded protrusions (317), while the curved rear surface (315) is arranged to cooperate with the overhanging charging handle (60 / 44) to assist with secure lockup, which may provide a stronger lock during recoil. A modular acceptance frame (45) may provide the structural registration for this interface. A battery (320) may be packaged within the module and can work in concert with a selector switch (319) to route power as needed through contact pads (194); the lower cavity (318) may be shown as the packaging volume that houses these elements or an accessory.

[0293] Referring to Fig. 63 (Upper Assembly On An External Host Platform). A modular upper assembly may be shown mounted to an external host platform (for example, a UAV). The assembly may register by a modular acceptance frame (45) at a forward escutcheon region and may couple by a quick detach interface (400) to a mount on the host. Power source terminals or a power bus connector may be provided to receive power and. where used, data from the host while installed, as may include a FCG actuator to access the lockw ork of the modular upper assembly. The host platform components are convent onal and are shown for context only.

[0294] Referring to Fig. 64, a dock body (401) presents angled receiver bays (402) for supporting multiple assemblies. Each bay includes a registration pilot to guide assembly insertion, a latch to retain it in a seated state, and rearward power and optional data contacts to mate with assembly terminals for charging and communication. The dock further includes a power input connector (407) and a network / bus connector (408) to distribute power and data. In some versions, inductive charging provides non-contact energy transfer, maintaining the firearm chassis in a sealed state.

[0295] Referring to Fig. 65, a modular suppressor (403) may be provided as a front module replacing the upper assembly’s front escutcheon. It couples to the same forward interface as other accessories, enabling tool-free installation and removal. A representative unit includes a suppressor housing (404), an attachment collar registered to a forward interface (e.g., boss or rotary dovetail), and an alignment feature (405) maintaining co-axiality with the barrel (65) and registering on thelower grip frame (1). Sealing and reaction surfaces manage gas and load transfer, and the module may be dimensioned for compact packaging or configured as a partially internal installation within the upper assembly envelope.

[0296] Referring to Fig. 66 (modular suppressor installed). A complementary view may depict the modular suppressor (403) installed on the assembled firearm platform (180).

[0297] Referring to Fig. 67. A cross-sectional view of the internal slide is show n, which presents the internal bore (197), with the angled bore (195), a front recoil surface (66), slide catch / release notch (98). safety pm hole (211), ejector slot (233). firing pin hole (232). and crescent shaped cut for hammer relief (409), w ith formed walls of relief (410).

Claims

CLAIMSWHAT IS CLAIMED IS:

1. A firearm comprising:(i) a structure; (ii) a barrel fixed to the structure and defining a bore axis; (iii) a reciprocating slide that substantially annularly surrounds a region of the barrel and is reciprocable along the bore axis; (iv) a primary bearing interface between a bore of the reciprocating slide and an exterior surface of the barrel, the bearing interface providing primary linear and radial guidance of the reciprocating slide relative to the barrel; and (v) a clocking interface between the reciprocating slide and one or both of a monoblock fixed to the barrel and the structure, the clocking interface constraining rotation of the reciprocating slide about the bore axis during reciprocation.

2. The firearm of claim 1, wherein a forward end of the reciprocating slide includes an oblique entry opening and an oblique pilot bore oriented at a non-zero entrance angle relative to the bore axis and sized to admit a forward portion of the barrel during assembly, the forward portion of the barrel extending axially beyond the forward end of the reciprocating slide in the assembled condition.

3. The firearm of claim 2, wherein complementary clearance and stop surfaces on the reciprocating slide and on one or both of (i) the barrel and (ii) a monoblock fixed to the barrel are configured to permit pivoting of the reciprocating slide at the entrance angle to align the reciprocating slide coaxially with the bore axis, and wherein, with the barrel fixed to the structure, the reciprocating slide is removable from the barrel only by a deliberate angular pivot through the oblique entry opening and is not removable by straight-line forward or rearward translation or by lifting off.

4. The firearm of claim 3, wherein the clocking interface is carried by the barrel or by a monoblock fixed to the barrel and comprises clocking flats on the barrel or monoblock received by formed inboard rails of the reciprocating slide after said pivoting, the formed inboard rails being created by intersection of the slide bore with an underside relief and dimensioned to slidably provide anti-rotation during reciprocation.

5. The firearm of claim 1, wherein a longitudinal bearing length of the primary bearing interface between the reciprocating slide and the barrel is greater than any longitudinal bearing length between the reciprocating slide and the structure.

6. A modular status module for a firearm having a magazine, comprising: (a) a structural body sized for installation within the firearm and, when installed, secured to a non-reciprocating portion of the firearm in fixed positional registration with the magazine well, the rear frame region, or both; (b) an input follower guided in the structural body for axial translation and positioned for operative engagement with a magazine follower when a magazine is received in the magazine well; (c) a helical axle rotatably supported by the structural body and having a helical guide feature engaged by the input follower such that axial displacement of the input follower causes rotation of the helical axle; (d) a toothed cog driven by rotation of the helical axle; and (e) an elongate display ribbon disposed within the structural body and advanced by the toothed cog, the ribbon bearing indicia of remaining cartridges; wherein, when installed, the module is operable without electrical power and does not intrude into a cartridge feed path.

7. The module of claim 6, wherein the input follower is constrained against rotation and guided for axial translation within the structural body, and wherein the helical axle comprises one of (i) a helix rod having a helical groove engaged by a guide projection of the input follower, or (ii) a twisted shaft received in a complementary non circular bore of the input follower, such that axial displacement of the non-rotating input follower induces rotation of the helical axle.

8. The module of claim 6, wherein the toothed cog is driven by the helical axle to advance the display ribbon within the structural body, the toothed cog and the display ribbon being indexed such that rotation of the helical axle through a predetermined angular increment advances the display ribbon by one position corresponding to a change of one in the remaining cartridge count.

9. The module of claim 6, further comprising a chamber present indicator including a sensing finger biased toward a chamber region and mechanically coupled to provide a visible chamber status indication concurrently with the display ribbon.

10. The module of claim 6, wherein the display ribbon comprises a clear substrate bearing an opaque coating that leaves transparent numerals as windows, and an illumination assemblypositioned behind the display ribbon to backlight the transparent numerals, the illumination assembly comprising one or more of: a radioluminescent source, a photoluminescent element chargeable by ambient light, an electroluminescent panel, a light emitting diode, an organic light emitting diode, and a light guide delivering light from a remote source.

11. A modular status module for a firearm having a magazine, comprising:(a) a structural body sized for installation within the firearm and, when installed, secured to a non-reciprocating portion of the firearm in fixed positional registration with the magazine well, the rear frame region, or both; (b) one or more circuit boards disposed within the firearm, including a circuit board in the structural body, and at least one sensor disposed on one of the circuit boards or elsewhere in the firearm and communicatively coupled to the one or more circuit boards, the at least one sensor being configured to determine one or both of: (i) presence, position, or movement of cartridges within a magazine received in the magazine well, and (ii) position or movement of a magazine follower therein; (c) processing circuitry on at least one of the circuit boards operatively coupled to the at least one sensor and configured to compute and maintain an integer remaining cartridge count based on a cartridge state indicated by the at least one sensor and to detect a magazine change event, without requiring any magazine borne powered sensor, processor, power source, or transducer that individually tracks cartridge movement; and (d) a user output subsystem comprising one or both of: (i) a display mounted to the structural body, and (ii) an interface configured to drive a display carried by the firearm or a head-mounted display.

12. The module of claim 11, wherein the at least one sensor and the processing circuitry are cooperatively configured to generate a status data set including at least one of: a SAFE or FIRE state, a warning indicator, a cartridges remaining in magazine indicator, a barrel temperature indicator, a total shots fired indicator, a chamber status indicator, a maintenance or board status indicator, and a battery level indicator, and to cause the user output subsystem to present corresponding indicators.

13. The module of claim 11, wherein the processing circuitry is configured to transmit a status data set derived from the at least one sensor to a head-mounted display computer via the interface recited in element (d) or via a communications interface, to cause the user output subsystem to present corresponding indicators, and to transmit the status data set to a remoteservice or to provide the status data set to the head-mounted display computer for transmission to the remote service.

14. The module of claim 11, further comprising a bi-directional communication interface, wherein the processing circuitry is configured to (i) transmit locally generated status data to at least one of a head-mounted display and a remote service, and (ii) receive status data from the head-mounted display or from an accessory device.

15. A firing control group for a hammer operated firearm having a reciprocating slide, the firing control group comprising: (i) a hammer pivotable about a hammer axle and defining a sear cavity that is open toward a sear backstrap, the cavity being bounded by an upper surface, a back surface, and a bottom surface, and the hammer further defining a curved cam surface; (ii) a sear formed as a substantially U or saddle shaped member having opposed walls, each wall defining a longitudinal slot sized to receive an axle so as to permit limited translation together with controlled rotation of the sear about the axle, the axle being the hammer axle or a separate sear axle, the sear further including a rear sear engagement region, referred to as a sear backstrap, transverse to the opposed walls and configured to be received within the hammer sear cavity; (iii) a biasing element urging the sear toward the hammer pivot axis; (iv) an energy storage member operatively coupled to the hammer to bias the hammer toward a firing direction; and (v) a trigger input member operable to move the sear from a hammer retaining condition to a release condition; wherein the bottom surface of the sear cavity forms a primary sear engagement that retains a lower portion of the sear backstrap at a lock condition, and the back surface limits inward translation of the sear backstrap; and wherein, during a cocking stroke, the curved cam surface of the hammer cams the sear rearward until the rear sear engagement region is received within the hammer sear cavity to capture the hammer at a lock condition; and wherein, during a slide induced overtravel event that rotates the hammer beyond the lock condition, an upper surface of the hammer sear cavity bears on an upper portion of the rear sear engagement region to pivot the sear about the axle and lift a forward region of the sear out of engagement with the trigger input member, thereby disconnecting the trigger input member without a separate disconnector and allowing the biasing element to return the sear so that the rear sear engagement region is again received within the hammer sear cavity for subsequent releasable engagement.

16. The firing control group of claim 15, further comprising a hammer thrust strut coupled to the hammer, wherein a rear portion of the hammer thrust strut is arranged to receive manual force directly or through a cap to act against the bias of the energy storage member and move the hammer rearward toward a lock condition, thereby reengaging the sear to hold the hammer in a locked and energized state.

17. The firing control group of claim 15, wherein the sear includes forward pylons, and the trigger input member is arranged to move the sear such that movement of the pylons first displaces a firing pin block of a reciprocating slide to a clearance state for a firing pin and then moves the sear from the hammer retaining condition to the release condition.

18. The firing control group of claim 17, wherein the trigger input member comprises a pivoted trigger operative along a curvilinear path to move the sear so that the pylons displace the firing pin block before the sear reaches the release condition.

19. The firing control group of claim 15, further comprising a de-cock actuator arranged to act on forward faces of the sear to displace the sear rearward and release the hammer while a firing pin block remains engaged.

20. A spring engagement controller for a firearm having a reciprocating slide and a primary recoil spring, the controller comprising: (a) a non-reciprocating charging handle movable between a home position and a charging position; (b) a lost-motion interface between the charging handle and the reciprocating slide that provides an initial dwell during which displacement of the charging handle does not translate the reciprocating slide; and (c) an actuator coupled to the charging handle and operable during the dwell to reconfigure the controller from a firing state in which the primary recoil spring is engaged to a charge assist state in which engagement of the primary recoil spring is reduced; wherein, after the dwell, the charging handle couples to the reciprocating slide to draw the reciprocating slide rearward while the controller remains in the charge assist state, and return of the charging handle toward the home position restores the controller to the firing state.

21. The controller of claim 20, wherein the actuator comprises a cam pin that drives a rotary cam or a cylinder follower, and the actuator is configured to alter a load path of the primary recoil spring between the firing state and the charge assist state.

22. The controller of claim 20, wherein the actuator comprises a pivoting blocker arranged to interrupt a reaction surface of the primary recoil spring during the dwell and to clear the reaction surface upon restoration to the firing state.

23. The controller of claim 20, wherein restoration to the firing state is responsive to the charging handle crossing a defined return threshold proximate the home position.

24. The controller of claim 20, further comprising a firing interlock permitting release of a firing mechanism only when the controller is in the firing state and the reciprocating slide is in battery.

25. The controller of claim 20, wherein the charge assist state reduces an apparent initial charging force by at least fifty percent over an assist window comprising about 20 to 50 millimeters of reciprocating slide travel.

26. A method of cocking a hammer of a firearm, the firearm having an internal hammer and an actuator accessible from the exterior of the firearm, the method comprising: applying an inward push on the actuator to translate or pivot a linkage that engages the hammer, thereby moving the hammer from a de-cocked position to a cocked position without manually retracting an exposed hammer.

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