Delayed blowback bolt assembly

Abstract

A bolt assembly includes a recoil recess, a locking roller pin opening and a bolt lock recess. A barrel carrier includes a first shelf and a second shelf. Each of the shelves defines a bevel having a sloped surface. A locking roller assembly includes a locking roller pin and locking roller positioned around the locking roller pin. The locking roller is positioned within the locking roller recess of the bolt and the locking roller pin is inserted through the locking roller pin opening of the bolt. The bolt has a forward position in which at least a portion of the locking roller pin is positioned in the bevel of each shelf, forward of the sloped surface of the bevel. The bolt also has a rearward position in which the locking roller pin is positioned rearwardly of each of the bevels of each shelf of the pair of shelves.

Description

[0001] DELAYED BLOWBACK BOLT ASSEMBLY

[0002] BACKGROUND OF THE INVENTION

[0003] The present invention pertains generally to firearms and, in particular aspects, to a delayed blowback bolt and bolt carrier for a firearm.

[0004] Delayed blowback mechanisms create additional mechanical resistance to rearward movement of the bolt, keeping the breech closed and allowing operating pressure in the chamber to decrease before the breech is opened. Decreasing the pressure inside the barrel before opening the bolt can reduce the recoil felt by the user upon firing the firearm and / or decrease the amount of gas that exits the rear of the barrel (i.e., through the breach of the firearm) which can cause fouling to the action of the firearm and / or may bother the shooter. There remains a desire for new and improved designs.

[0005] SUMMARY OF THE INVENTION

[0006] A bolt assembly may comprise a bolt including a front bolt surface, a rear bolt surface, a first bolt side surface, and a second bolt side surface. A recoil recess may be defined through the rear bolt surface. A locking roller pin opening may be defined through the bolt leading to a locking roller recess defined between the first and second bolt side surfaces. A bolt lock recess may be defined through the front bolt surface. The bolt may also include a firing pin recess defined through the rear bolt surface. A recoil rod and a recoil spring may be positioned around the recoil rod. At least a portion of the recoil rod and / or the recoil spring may be positioned within the recoil recess defined in the bolt.

[0007] A barrel carrier may include a first shelf and a second shelf. Each of the first shelf and the second shelf may define a bevel having a sloped surface. The first shelf and the second shelf of the barrel carrier may be separated by a shelf gap.

[0008] A locking roller assembly may include a locking roller pin and a locking roller positioned around the locking roller pin. The locking roller may be positioned within the locking roller recess of the bolt and the locking roller pin may be inserted through the locking roller pin opening. The locking roller assembly may also include a safety ring positioned between the locking roller pin and the locking roller. The safety ring may be wrapped around a perimeter of the locking roller pin. The locking roller may be positioned within the shelf gap when the locking roller is positioned in the locking roller recess.

[0009] The bolt assembly may also include a bolt lock which may include a lock spring. The lock spring may be positioned within the bolt lock recess of the bolt. The bolt lock may include a bolt lock head and a bolt lock body. At least a portion of the bolt lock body may be positioned within the bolt lock recess. The bolt lock body may include a locking roller notch defined within a portion of the bolt lock body. The locking roller notch of the bolt lock body may receive the locking roller of the locking roller assembly when the locking roller is positioned in the locking roller recess of the bolt. In some instances, the locking roller notch may have an angled portion. The lock spring may abut a rear surface of the bolt lock body.

[0010] The bolt may have a forward position in which at least a portion of the locking roller pin is positioned in the bevel of each shelf, forward of the sloped surface of the bevel. In some examples, the locking roller is in contact with the angled portion of the bolt lock notch when the bolt is in the forward position. The bolt may also have a rearward position in which the locking roller pin is positioned rearwardly of each of the bevels of each shelf of the pair of shelves.

[0011] Advantageously, in the presently disclosed arrangements, the locking roller pin can rotate independently and / or at a different angular velocity than locking roller. For example, when the locking roller pin rolls along at least a portion of the bevel (e.g., the sloped surface), the locking roller pin can rotate at a first angular velocity while the locking roller rotates at a second angular velocity along the bolt lock body. Additionally, after the locking roller pin is positioned outside of the bevel and atop the shelf during cycling of the bolt of the firearm during operation, the locking roller pin can roll along a length of the shelf while the locking roller remains stationary against the bolt lock body. As those of skill in the art will appreciate, this can aid in reducing the surface wear of one or more of the above components, such as by promoting the locking roller pin and the locking roller moving by rolling — rather than sliding — along their respective surfaces of the barrel carrier and the bolt lock body. Moreover, for what surface wear does occur, it can be concentrated in the interface between the locking roller pin and the locking roller, which comprise less material and can be cheaper and / or easier to replace than the barrel carrier and / or the bolt lock body.

[0012] Additionally, the advantage of independent and / or different angular velocity rotation of the locking roller pin and the locking roller can provide for a greater range of angles, and difference between the angles, for the sloped surface of the bevel and the angled portion of the bolt lock body relative to systems that simply use a single locking roller pin. During vertical movement of the locking roller assembly, both the locking roller pin and the locking roller translate the same distance vertically relative to the bolt. However, in instances where the angled portion of the bolt lock body has a gentler slope than the sloped surface of the bevel, the locking roller will force the bolt lock to translate a greater distance horizontally relative to the bolt than the locking roller pin will travel horizontally along the shelf.

[0013] Preferably the locking roller is sized proportionally larger than the locking roller pin such that both the locking roller and the locking roller pin rotate at the same angular velocity despite the difference in slopes between the angled portion of the bolt lock body and the sloped surface of the bevel. However, in instance that is not the case, or in instances where the slopes of one or both of the angled portion and / or the sloped surface vary along their length, providing for rotation of the locking roller independently and / or at a different angular velocity than the locking roller pin can allow for the locking roller and the locking roller pin to travel along their respective contact surfaces by rolling (rather than sliding).

[0014] Also advantageously, during assembly and disassembly of the firearm, the locking roller and the safety ring can resist the locking roller pin from exiting the locking roller pin opening of the bolt. Accordingly, assembly and disassembly of the firearm can be eased and / or simplified for a user.

[0015] BRIEF DESCRIPTION OF THE DRAWINGS

[0016] FIG. 1 is a right side view of a firearm.

[0017] FIG. 2 is a left side view of the firearm of FIG. 1.

[0018] FIG. 3 is a perspective view of the bolt assembly of the firearm of FIG. 1.

[0019] FIG. 4 is a rear perspective view of a bolt of the bolt assembly of FIG. 3.

[0020] FIG. 5 is a cross-sectional view of the bolt of FIG. 4.

[0021] FIG. 6 is a front perspective view of the bolt of FIG. 4.

[0022] FIG. 7 is a left side view of a bolt lock of the bolt assembly of FIG. 3.

[0023] FIG. 8 is a front perspective view of a barrel carrier of the firearm of FIG. 1.

[0024] FIG. 9 is a perspective view of a locking roller assembly of the bolt assembly of FIG. 3.

[0025] FIG. 10 is a cross-sectional view of the locking roller assembly of FIG. 9.

[0026] FIG. 11 is a cross-sectional view of the bolt assembly of FIG. 3 in a forward position.

[0027] FIG. 12 is perspective view of the bolt assembly of FIG. 11 in the forward position with the bolt removed for ease of understanding.

[0028] FIG. 13 is a perspective view of the bolt assembly of FIG. 3 in a rearward position.

[0029] FIG. 14 is perspective view of the bolt assembly of FIG. 13 in the rearward position with; the bolt removed for ease of understanding.

[0030] DESCRIPTION OF THE SELECTED EMBODIMENTS

[0031] For the purpose of promoting an understanding of the principles of the invention, reference will now be made to the embodiments illustrated in the drawings and specific language will be used to describe the same. It will nevertheless be understood that no limitation of the scope of the invention is thereby intended. Any alterations and further modifications in the described embodiments, and any further applications of the principles of the invention as described herein are contemplated as would normally occur to one skilled in the art to which the invention relates. One embodiment of the invention is shown in great detail, although it will be apparent to those skilled in the relevant art that some features that are not relevant to the present invention may not be shown for the sake of clarity.

[0032] Directional terms, such as forward, rearward, top, bottom, etc., are used in this description with reference to the specific embodiment shown and used for purposes of clarity. It should be recognized that these terms are not meant to be limiting. For the purposes of this description, the term “forward” refers to the direction moving toward the front end of the barrel, where a bullet exits upon being fired. The term “rearward” refers to a direction moving toward the grip end of the firearm.

[0033] A right side view of a firearm 20 is shown in FIG. 1. The firearm 20 includes an upper receiver 25 and a lower receiver 30. A stock 45 extends rearwardly from the upper receiver 25 and the lower receiver 30. The lower receiver 30 includes a grip 32 and a trigger guard 35 that surrounds a trigger mechanism 40. The lower receiver 30 also defines a magazine well 50 for receiving a magazine 52. A barrel 55 is partially positioned within and extends forward of the upper receiver 25. The firearmpO includes a bolt release assembly 210. A bolt release lever of the bolt release assembly 210 is positioned on the right side of the firearm 20. In the embodiment shown, the bolt release lever spans between the upper receiver 25 and the lower receiver 30. However, in other embodiments, the position of the bolt release assembly 210 may vary. For example, the bolt release assembly 210 may be completely contained within the lower receiver 30.

[0034] The firearm 20 also includes a magazine catch lever assembly 110 for retaining the magazine 52 within the magazine well 50. As shown, a press button of the magazine catch lever assembly 110 is accessible from the right side of the firearm 20. In the embodiment shown, the press button is located on the lower receiver 30, near the trigger guard 35 and below the bolt release lever of the bolt release assembly 210. In other embodiments, the magazine catch lever assembly 110 may be accessible from other suitable locations on the right side of the firearm 20.

[0035] A left side view of the firearm 20 is illustrated in FIG. 2. A bolt release lever of the bolt release assembly 210 is also accessible on the left side of the firearm 20, allowing the bolt release assembly 210 to be operated from either the left side or the right side of the firearm 20. fri the embodiment shown, the bolt release lever on the left side of the firearm 20 spans between the upper receiver 25 and the lower receiver 30.

[0036] A magazine catch lever of the magazine catch lever assembly 110 is also accessible from the left side of the firearm 20, allowing the magazine catch lever assembly 110 to be operated from either the left side or the right side. In the embodiment shown, the magazine catch lever is located within the lower receiver 30, forward of the trigger guard 35.

[0037] An exemplary bolt assembly 110 of the firearm 20 is illustrated in FIG. 3. The bolt assembly 110 includes a bolt 120, a bolt lock 140, a locking roller assembly 150, and a barrel carrier 160. The locking roller assembly 150 is positioned between the bolt 120 and the barrel carrier 160. A recoil spring assembly 180 extends rearwardly from the bolt 120. The recoil spring assembly 180 includes a recoil rod 182 and a recoil spring 185 positioned around the recoil rod 182. A recoil buffer 188 is positioned at the rearward end of the recoil rod 182.

[0038] A rear perspective view of the bolt 120 is shown in FIG. 4. The bolt 120 includes a bolt body 121 having a front bolt surface 122 and a rear bolt surface 123 and a pair of bolt side surfaces 124. A recoil recess 125 is defined through the rear surface 123 of the bolt 120 and sized to receive at least a portion of the recoil spring assembly 180. As an example, the recoil recess 125 has a diameter that is large enough to receive at least a portion of the recoil rod 182 and / or the recoil spring 185 when the recoil spring 185 is positioned around the recoil rod 182. The bolt body 121 also defines a firing pin recess 127 that extends through the rear surface 123 of the bolt 120. The firing pin recess 127 is sized to receive a firing pin for firing the firearm. In the embodiment shown, the firing pin recess 127 is positioned below the recoil recess 125.

[0039] A locking roller recess 135 is defined between the side surfaces 124 of the bolt 120. As shown in FIG. 5, a locking roller pin opening 136 is defined through each of the side surfaces 124 of the bolt 120 to allow access to the locking roller recess 135. In the embodiment shown, the locking roller pin opening 136 has an oblong (e.g., elongated oval) shape that has a height that is greater than its width. The locking roller recess 135 may also be accessed from underneath the bolt body 121, as the bottom of the bolt body 121 is open at the locking roller recess 135. The locking roller recess 135 is in communication with a bolt lock recess 131 which is configured to receive at least a portion of the bolt lock 140.

[0040] A front perspective view of the bolt 120 is illustrated in FIG. 6. As shown, the bolt lock recess 131 is defined through the front surface 122 of the bolt body 121. The bolt 120 also includes a breach surface 133 for receiving a rear end of a cartridge inserted in the breach end of the barrel of the firearm 20.

[0041] FIG. 7 illustrates a side view of the bolt lock 140. The bolt lock 140 includes a bolt lock head 142 and a bolt lock body 143 extending rearwardly from the bolt lock head 142. In the embodiment shown, the bolt lock body 143 has a circular cross-section and has a diameter that is less than the width of the bolt lock head 142. A locking roller notch 145 extends through a portion of the bolt lock body 143 and is defined by a notch surface 146 on the bolt lock body 143. The notch surface 146 includes an angled portion 147. The bolt lock 140 also includes a lock spring 149 that is adjacent to a bolt lock rear surface 144 of the bolt lock body 143.

[0042] The barrel carrier 160 is shown in more detail in FIG. 8. The barrel carrier 160 includes a barrel carrier body 161 that has a barrel carrier top surface 162. A pair of barrel carrier arms 163 extend from the barrel carrier top surface 162 forming a shelf gap 164 between the arms 163. Each arm 163 includes a carrier shelf 165 positioned above the top of a respective arm 163. The shelf 165 has a length that is shorter than the length of the arm 163 so that the shelf 165 extends along only along a portion of the length of the arm 163. Each shelf 165 defines a bevel 166 that forms a trough-shaped recess in the shelf 165. The bevel 166 includes a sloped surface 168 on the shelf 165. A barrel opening 171 is defined through the barrel carrier body 161 and configured to receive the barrel of the firearm 20.

[0043] FIG. 9 illustrates the locking roller assembly 150. The locking roller assembly 150 includes a locking roller pin 152, a locking roller 156, and a safety ring 158 (see FIG. 10). The locking roller 156 has a cylindrical shape and includes a locking roller opening 157 defined through the locking roller 156. The locking roller pin 152 extends through the locking roller opening 157. As shown in FIG. 10, the safety ring 158 is positioned within the locking roller opening 157 and between the locking roller pin 152 and the locking roller 156. The safety ring wraps at least partially around the circumference of the locking roller pin 152 and assists to keep the locking roller pin 152 from falling out of the bolt 120 when the bolt 120 is removed from the lower receiver 30 of the firearm 20 (e.g., by the safety ring engaging one or more grooves 159 in the surface of the locking roller 156 defining the locking roller opening 157 and / or in the outer surface of the locking roller pin 152 positioned within the locking roller opening 157 in the assembly locking roller assembly 150).

[0044] A cross-sectional view of the bolt assembly 110 with the bolt 120 in a forward position is illustrated in FIG. 11. The recoil rod 182 extends through the recoil recess 125 of the bolt 120, and the bolt 120 is biased into the forward position by the recoil spring 185 which surrounds the recoil rod 182. In the forward position, the bolt 120 abuts the barrel carrier 160. The bolt lock 140 is positioned in the bolt lock recess 131 of the bolt 120 and is biased forward by the lock spring 149. When the bolt lock 140 is in the forward position, the angled portion 147 of the notch surface 146 of the bolt lock body 143 contacts the locking roller 156 to urge the locking roller assembly 150 downward, towards the barrel carrier 160, so that the locking roller pin is positioned in the each of the bevels 166 of the shelves 165 of the barrel carrier 160 (see FIG. 12). After the firearm 20 is fired, the propellant gases within the barrel of the firearm 20 provide a rearward force on the bolt 120. Rearward movement of the bolt 120, however, is slowed (e.g., “delayed”). At the moment of firing, the locking roller pin 152 is in the bevels 166 of the barrel carrier 160. During movement of the bolt 120 rearwardly against the bias of the recoil spring 185, the locking roller pin 152 is urged rearwardly with the bolt 120 due to the locking roller pin 152 being positioned within the locking roller pin opening 136 of the bolt 120. Initially, during this rearward movement of the bolt 120, the locking roller pin 152 is forced upwards due to contact with the sloped surface 168 of the bevels 166. And, as the locking roller pin 152 moves upwards, the locking roller 156 is forced upwards against the angled portion 147 of the bolt lock body 143 which, in turn, moves the bolt lock 140 rearwardly relative to the bolt 120 and against the force of the lock spring 149. These additional movements and forces required to move the locking roller pin 152 and locking roller 156 upward to move the bolt lock 140 rearwardly against the force of the lock spring 149 slows the initial rearward movement of the bolt 120. As the bolt 120 continues to move rearwardly, however, the locking roller pin 152 eventually exits the bevels 166 while the locking roller 156 forces the bolt lock 140 rearwardly enough, relative to the bolt 120, for the locking roller assembly 150 to enter the locking roller notch 145.

[0045] As shown in FIGS. 13-14, as the bolt 120 moves into a rearward position, the locking roller pin 152 is also moved rearward, out of the bevels 166 on the barrel carrier 160 and onto the top of the shelf 165 of the barrel carrier 160. The locking roller assembly 150 moves upward within the locking roller pin opening 136 of the bolt 120. The resistance provided by the locking roller assembly 150, bolt lock 140 and lock spring 149 to slow the rearward movement of the bolt 120 and, preferably, allows the fired bullet to leave the barrel and the internal pressure within the barrel to decrease before the bolt 120 starts to move rearwardly. This action may reduce the felt recoil upon firing the firearm 20 and / or the amount of gas that escapes the breach end of the barrel during firing and may allow for a bolt 120 that has a lighter weight as compared to similar block-back operated firearm without the additional structure to slow rearward movement of the bolt.

[0046] Advantageously, in the presently disclosed arrangements, locking roller pin 152 can rotate independently and / or at a different angular velocity than locking roller 156. For example, when locking rollerjpin 152 rolls along at least aportion of bevel 166 (e.g., sloped surface 168), the locking roller pin 152 can rotate at a first angular velocity while the locking roller 156 rotates at a second angular velocity along the bolt lock body 143. Additionally, after the locking roller pin 152 is positioned outside of bevel 166 and atop shelf 165 during cycling of the bolt of the firearm during operation, locking roller pin 152 can roll along a length of the shelf while locking roller 156 remains stationary against the bolt lock body 143. As those of skill in the art will appreciate, this can aid in reducing the surface wear of one or more of the above components, such as by promoting the locking roller pin 152 and locking roller 156 moving by rolling — rather than sliding — along their respective surfaces of the barrel carrier 160 and the bolt lock body 143. Moreover, for what surface wear does occur, it can be concentrated in the interface between the locking roller pin 152 and the locking roller 156, which comprise less material and can be cheaper and / or easier to replace than the barrel carrier 160 and / or the bolt lock body 143.

[0047] Additionally, the advantage of independent and / or different angular velocity rotation of the locking roller pin 152 and the locking roller 156 can provide for a greater range of angles, and difference between the angles, for the sloped surface 168 of the bevel 166 and angled portion 147 of the bolt lock body 143 relative to systems that simply use a single locking roller pin. During vertical movement of the locking roller assembly 150, both the locking roller pin 152 and the locking roller 156 translate the same distance vertically relative to the bolt. However, in instances where the angled portion 147 of the bolt lock body 143 has a gentler slope than the sloped surface 168 of the bevel 166, the locking roller 156 will force the bolt lock 140 to translate a greater distance horizontally relative to the bolt 120 than the locking roller pin 152 will travel horizontally along shelf 165.

[0048] Preferably the locking roller 156 is sized proportionally larger than the locking roller pin 152 such that both the locking roller 156 and locking roller pin 152 rotate at the same angular velocity despite the difference in slopes between the angled portion 147 of the bolt lock body 143 and the sloped surface 168 of the bevel 166. However, in instances that is not the case, or in instances where the slopes of one or both of the angled portion 147 and / or the sloped surface 168 vary along their length, providing for rotation of the locking roller 156 independently and / or at a different angular velocity than the locking roller pin 152 can allow for the locking roller 156 and locking roller pin 152 to travel along their respective contact surfaces by rolling (rather than sliding).

[0049] Also advantageously, during assembly and disassembly of the firearm, the locking roller 156 and safety ring 158 can resist the locking roller pin 152 from exiting the locking roller pin opening 136 of the bolt 120. Accordingly, assembly and disassembly of the firearm can be eased and / or simplified for a user.

[0050] The following numbered clauses set out specific embodiments that may be useful in understanding the present invention:

[0051] 1. A bolt assembly comprising: a bolt including a front bolt surface, a rear bolt surface, a first bolt side surface, and a second bolt side surface, wherein a recoil recess is defined through the rear bolt surface, a locking roller pin opening is defined through the bolt leading to a locking roller recess defined between said first and second bolt side surfaces, and a bolt lock recess is defined through the front bolt surface; a bolt lock including a lock spring, wherein said lock spring is positioned within said bolt lock recess of said bolt; a barrel carrier including a first shelf and a second shelf, wherein each of said first shelf and said second shelf defines a bevel having a sloped surface; a locking roller assembly, wherein said locking roller assembly includes a locking roller pin and a locking roller positioned around said locking roller pin, and wherein said locking roller is positioned within said locking roller recess of said bolt and said locking roller pin is inserted through said locking roller pin opening; a recoil rod and a recoil spring positioned around said recoil rod, wherein at least a portion of said recoil rod and said recoil spring is positioned within said recoil recess defined in said bolt; wherein said bolt has a forward position in which at least a portion of said locking roller pin is positioned in the bevel of each shelf, forward of the sloped surface of said bevel; and wherein said bolt has a rearward position in which the locking roller pin is positioned rearwardly of each of the bevels of each shelf of the first and second shelves.

[0052] 2. The bolt assembly of clause 1, further comprising: a safety ring positioned between said locking roller pin and said locking roller.

[0053] 3. The bolt assembly of clause 2, wherein said safety ring is wrapped around a perimeter of said locking roller pin.

[0054] 4. The bolt assembly of any preceding clause, wherein said bolt lock includes a bolt lock head and a bolt lock body, wherein at least a portion of said bolt lock body is positioned within said bolt lock recess.

[0055] 5. The bolt assembly of clause 4, wherein said bolt lock body includes a locking roller notch defined within a portion of said bolt lock body.

[0056] 6. The bolt assembly of clause 5, wherein locking roller notch of said bolt lock body receives said locking roller of said locking roller assembly when said locking roller is positioned in said locking roller recess of said bolt. 7. The bolt assembly of any one of clauses 4-6, wherein said lock spring abuts a rear surface of said bolt lock body.

[0057] 8. The bolt assembly of any preceding clause, wherein said first shelf and said second shelf * of said barrel carrier are separated by a shelf gap.

[0058] 9. The bolt assembly of clause 8, wherein said locking roller is positioned within said shelf i gap when said locking roller is positioned in said locking roller recess.

[0059] 10. The bolt assembly of any preceding clause, wherein said bolt includes a firing pin recess . defined through said rear bolt surface.

[0060] 11. A bolt assembly for a firearm, the bolt assembly comprising: a bolt including a bolt lock recess and a locking roller recess; a bolt lock, wherein said at least a portion of said bolt lock is positioned within said bolt lock recess of said bolt; a barrel carrier including a first carrier shelf and a second carrier shelf, wherein said first carrier shelf defines a first bevel having a sloped surface and said second carrier shelf defines a second bevel having a sloped surface; a locking roller assembly, wherein said locking roller assembly includes a locking roller pin and a locking roller positioned around said locking roller pin; wherein said locking roller is positioned within said locking roller recess of said bolt; wherein said bolt has a forward position in which at least a portion of said locking roller pin is positioned in said first bevel and in said second bevel, forward of the sloped surface of said bevel; and wherein said bolt has a rearward position in which the locking roller pin is positioned rearward of said bevel of said first carrier shelf and of said second carrier shelf. 12. The bolt assembly of clause 11 , wherein said locking roller pin is inserted through a locking roller pin opening defined through said locking roller.

[0061] 13. The bolt assembly of clause 11 or 12, wherein a safety ring is positioned between said locking roller pin and said locking roller.

[0062] 14. The bolt assembly of clause 13, wherein said safety ring surrounds at least a portion of a perimeter of said locking roller pin.

[0063] 15. The bolt assembly of any one of clauses 11-14, wherein said first carrier shelf and said second carrier shelf of said barrel carrier are separated by a shelf gap.

[0064] 16. The bolt assembly of clause 15, wherein said locking roller is positioned within said shelf gap when said locking roller is positioned within said locking roller recess.

[0065] 17. The bolt assembly of any one of clause 11-16, wherein said bolt lock defines a locking roller notch having an angled portion, and wherein said locking roller is in contact with said angled portion of the locking roller notch when the bolt is in the forward position.

[0066] 18. The bolt assembly of any one of clauses 11-17, wherein said bolt lock includes a lock spring, and wherein said lock spring is positioned within said bolt lock recess.

[0067] 19. The bolt assembly of any one of clauses 11-18, wherein said bolt includes a recoil recess and a recoil rod at least partially positioned within said recoil recess.

[0068] 20. The bolt assembly of clause 19, wherein a recoil spring surrounds said recoil rod, and wherein said recoil spring biases said bolt into said forward position.

[0069] While the invention has been illustrated and described in detail in the drawings and foregoing description, the same is to be considered as illustrative and not restrictive in character, it being understood that only the preferred embodiment has been shown and described and that all changes, equivalents, and modifications that come within the spirit of the inventions defined by following claims are desired to be protected. All publications, patents, and patent applications cited in this specification are herein incorporated by reference as if each individual publication, patent, or patent application were specifically and individually indicated to be incorporated by reference and set forth in its entirety herein.

Claims

CLAIMS1. A bolt assembly comprising: a bolt including a front bolt surface, a rear bolt surface, a first bolt side surface, and a second bolt side surface, wherein a recoil recess is defined through the rear bolt surface, a locking roller pin opening is defined through the bolt leading to a locking roller recess defined between said first and second bolt side surfaces, and a bolt lock recess is defined through the front bolt surface; a bolt lock including a lock spring, wherein said lock spring is positioned within said bolt lock recess of said bolt; a barrel carrier including a first shelf and a second shelf, wherein each of said first shelf and said second shelf defines a bevel having a sloped surface; a locking roller assembly, wherein said locking roller assembly includes a locking roller pin and a locking roller positioned around said locking roller pin, and wherein said locking roller is positioned within said locking roller recess of said bolt and said locking roller pin is inserted through said locking roller pin opening; a recoil rod and a recoil spring positioned around said recoil rod, wherein at least a portion of said recoil rod and said recoil spring is positioned within said recoil recess defined in said bolt; wherein said bolt has a forward position in which at least a portion of said locking roller pin is positioned in the bevel of each shelf, forward of the sloped surface of said bevel; and wherein said bolt has a rearward position in which the locking roller pin is positioned rearwardly of each of the bevels of each shelf of the first and second shelves.

2. The bolt assembly of claim 1, further comprising: a safety ring positioned between said locking roller pin and said locking roller.

3. The bolt assembly of claim 2, wherein said safety ring is wrapped around a perimeter of - said locking roller pin.

4. The bolt assembly of claim 1 , wherein said bolt lock includes a bolt lock head and a bolt lock body, wherein at least a portion of said bolt lock body is positioned within said bolt lock recess.

5. The bolt assembly of claim 4, wherein said bolt lock body includes a locking roller notch defined within a portion of said bolt lock body.

6. The bolt assembly of claim 5, wherein locking roller notch of said bolt lock body receives said locking roller of said locking roller assembly when said locking roller is positioned in said locking roller recess of said bolt.

7. The bolt assembly of claim 4, wherein said lock spring abuts a rear surface of said bolt lock body.

8. The bolt assembly of claim 1 , wherein said first shelf and said second shelf of said barrel carrier are separated by a shelf gap.

9. The bolt assembly of claim 8, wherein said locking roller is positioned within said shelf gap when said locking roller is positioned in said locking roller recess.

10. The bolt assembly of claim 1 , wherein said bolt includes a firing pin recess defined through said rear bolt surface.

11. A bolt assembly for a firearm, the bolt assembly comprising: a bolt including a bolt lock recess and a locking roller recess; a bolt lock, wherein said at least a portion of said bolt lock is positioned within said bolt lock recess of said bolt; a barrel carrier including a first carrier shelf and a second carrier shelf, wherein said first carrier shelf defines a first bevel having a sloped surface and said second carrier shelf defines a second bevel having a sloped surface;a locking roller assembly, wherein said locking roller assembly includes a locking roller pin and a locking roller positioned around said locking roller pin; wherein said locking roller is positioned within said locking roller recess of said bolt; wherein said bolt has a forward position in which at least a portion of said locking roller pin is positioned in said first bevel and in said second bevel, forward of the sloped surface of said bevel; and wherein said bolt has a rearward position in which the locking roller pin is positioned rearward of said bevel of said first carrier shelf and of said second carrier shelf.

12. The bolt assembly of claim 11, wherein said locking roller pin is inserted through a locking roller pin opening defined through said locking roller.

13. The bolt assembly of claim 11, wherein a safety ring is positioned between said locking roller pin and said locking roller.

14. The bolt assembly of claim 13, wherein said safety ring surrounds at least a portion of a perimeter of said locking roller pin.

15. The bolt assembly of claim 11, wherein said first carrier shelf and said second carrier shelf of said barrel carrier are separated by a shelf gap.

16. The bolt assembly of claim 15, wherein said locking roller is positioned within said shelf gap when said locking roller is positioned within said locking roller recess.

17. The bolt assembly of claim 11, wherein said bolt lock defines a locking roller notch having an angled portion, and wherein said locking roller is in contact with said angled portion of the locking roller notch when the bolt is in the forward position.

18. The bolt assembly of claim 11, wherein said bolt lock includes a lock spring, and wherein said lock spring is positioned within said bolt lock recess.

19. The bolt assembly of claim 11, wherein said bolt includes a recoil recess and a recoil rod at least partially positioned within said recoil recess.

20. The bolt assembly of claim 19, wherein a recoil spring surrounds said recoil rod, and wherein said recoil spring biases said bolt into said forward position.

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