Readiness-to-fire sensors for firearms

Abstract

A readiness-to-fire sensor (100) includes a case (110), an interface (120), and a probe (130). configured to be installed on a receiver (50) of a selective-fire firearm (20) that has a selector (70). The case is configured to be installed on a receiver (50) of a selective-fire firearm (20). The interface is configured to interface with an electrical accessory (80) for the firearm. The probe is operatively coupled to the interface, and is mounted in a manner in which installation of the case on the receiver engages the probe with the selector in a manner in which the probe moves responsively to rotation of the selector such that, in a first firing mode and a second firing mode of the firearm, but not in a safe mode of the firearm, the sensor activates the electrical accessory via the interface. Other embodiments are also described.

Description

READINESS-TO-FIRE SENSORS FOR FIREARMSCROSS-REFERENCES TO RELATED APPLICATIONS

[0001] The present application claims priority from Israel Patent Application 312089, filed 11 April 2024, and titled "Readiness-to-fire sensors for firearms," which is incorporated herein by reference.FIELD OF THE INVENTION

[0002] Some applications of the present invention relate in general to firearms, such as small arms. More specifically, some applications of the present invention relate to improved use of electrical accessories for small arms such as selective-fire rifles.SUMMARY OF THE INVENTION

[0003] This summary is meant to provide some examples and is not intended to be limiting of the scope of the invention in any way. For example, any feature included in an example of this summary is not required by the claims, unless the claims explicitly recite the features. Also, the features, components, steps, concepts, etc. described in examples in this summary and elsewhere in this disclosure can be combined in a variety of ways. Various features and steps as described elsewhere in this disclosure may be included in the examples summarized here.

[0004] Numerous devices and scenarios may benefit from reliable sensing that a firearm is in a ready-to-fire state. For example, some battery-powered firearm accessories may benefit from being powered only when the firearm is ready-to-fire, in order to extend battery life. Furthermore, readiness-to-fire (RTF) sensing may improve firearm safety, such as at shooting ranges. RTF sensors are therefore disclosed herein. Still further, in combat situations, RTF sensing may be useful for command and control purposes as well as for documenting aspects of the combat - e.g. for future investigations and / or learning.

[0005] In some implementations, RTF sensors for selective-fire firearms are configured to sense RTF by sensing a state of a selector of the selective-fire firearm, such as by sensing whether or not the selector is in its safe mode - e.g. rather than in one of its firing modes. Thus, in some implementations, the selector being out of its safe mode is identified as RTF. In some such implementations, the sensor includes a probe that engages the selector. The probe may move responsively to movement of the selector, and this movement may actuatea switch of the sensor. The probe may engage the selector in a way that does not interfere with normal use and / or movement of the selector. For example, the probe may engage the block of the selector, rather than the lever of the selector. Similarly, the sensor may be configured to be installed in a manner that does not obstruct or otherwise interfere with the selector. For example, the sensor may be configured for installation on the receiver of the firearm (e.g. on the side of the receiver opposite from the lever of the selector) or within the handle of the firearm.

[0006] The sensor advantageously means that the operator of the firearm need not change his / her behavior or habits with respect to the firearm, and need not interact directly or consciously with the electrical accessory. Rather, the operator indirectly operates the electrical accessory through normal use of the selector.

[0007] In some implementations, an RTF sensor has a pressure switch, and is configured to be installed on the butt of the stock of the firearm, such that contact and / or pressure between the butt and the shoulder of the operator is sensed. Thus, in some implementations, contact and / or pressure between the butt and the shoulder of the operator is identified as RTF.

[0008] There is therefore provided, in accordance with some implementations, apparatus for use with an electrical accessory for a selective-fire firearm that has a receiver and a selector, the selector including (i) a block that defines a block axis and that extends transversely through the receiver, and (ii) a lever attached to the block and extending radially away from the block axis such that pivoting the lever about the block axis rotates the block around the block axis to select between a safe mode of the firearm, a first firing mode of the firearm, and a second firing mode of the firearm.

[0009] The apparatus may include a readiness-to-fire sensor. The sensor may include a case, an interface, and / or a probe.

[0010] The case may be configured to be installed on the receiver of the firearm.

[0011] The interface may be configured to interface with the electrical accessory.

[0012] The probe may be operatively coupled to the interface. In some implementations, the probe is mounted such that installation of the case on the receiver engages the probe with the block in a manner in which the probe moves responsively to rotation of the block such that, in the first firing mode and the second firing mode but not in the safe mode, the sensor activates the electrical accessory via the interface.

[0013] In some implementations, the sensor includes a spring that, while the case remains mounted on the receiver, presses the probe against the block.

[0014] In some implementations, the sensor further includes an override, manually actuatable to activate the electrical accessory via the interface.

[0015] In some implementations, the firearm is an assault rifle.

[0016] In some implementations, the receiver is a lower receiver, and the firearm further includes an upper receiver secured to the lower receiver.

[0017] In some implementations, the probe is configured to engage the block via adhesion.

[0018] In some implementations, the probe is configured to engage the block via mating geometry.

[0019] In some implementations, the probe is configured to engage the block via threading.

[0020] In some implementations, the probe is configured to engage the block via friction.

[0021] In some implementations, the case is configured to be installed on an opposite side of receiver from the lever.

[0022] In some implementations, the sensor is configured to activate the electrical accessory via the interface whenever the selector is not in the safe mode.

[0023] In some implementations, the sensor further includes an inclinometer, and is configured to activate the electrical accessory via the interface only upon both (i) the selector being in either the first firing mode or the second firing mode, and (ii) the inclinometer detecting that the a slope at which the firearm is currently held is within a predetermined threshold.

[0024] In some implementations, the apparatus further includes a jig, shaped complementarity with respect to the firearm and configured to guide positioning of the case for installation on the receiver.

[0025] In some implementations, the jig is configured to reversibly snap-fit onto the firearm.

[0026] In some implementations, the case is mounted on, and removable from, the jig.

[0027] In some implementations, the apparatus includes the electrical accessory.

[0028] In some implementations, the electrical accessory is a flashlight.

[0029] In some implementations, the electrical accessory is a laser sight.

[0030] In some implementations, the electrical accessory is a scope.

[0031] In some implementations, the electrical accessory is a component of an Identification Friend or Foe (IFF) system.

[0032] In some implementations, the electrical accessory is a transmitter.

[0033] In some implementations, the electrical accessory is a transponder.

[0034] In some implementations, the electrical accessory is a transceiver.

[0035] In some implementations, the electrical accessory is a gun-safety accessory.

[0036] In some implementations, the interface is an electrical terminal, and the sensor is configured to activate the electrical accessory by powering the electrical accessory via the electrical terminal.

[0037] In some implementations, the sensor is configured to be connected to a power source external to the sensor, and to power the electrical accessory via the electrical terminal by transferring power from the power source to the electrical accessory.

[0038] In some implementations, the power source is mounted on the firearm, and the sensor is configured to be connected to the power source that is mounted on the firearm.

[0039] In some implementations, the power source is housed by the electrical accessory, and the sensor is configured to serve as a power switch of the electrical accessory.

[0040] In some implementations, the interface is a transmitter, and the sensor is configured to activate the electrical accessory by transmitting a signal to the electrical accessory.

[0041] In some implementations, the signal is an electrical signal, and the transmitter is wiredly connectable to the electrical accessory, and configured to activate the electrical accessory by wiredly transmitting the electrical signal to the electrical accessory.

[0042] In some implementations, the signal is a wireless signal, and the transmitter is configured to activate the electrical accessory by wirelessly transmitting the wireless signal to the electrical accessory.

[0043] In some implementations, the case has a back, the probe is mounted to protrude through the back, and the case is configured to be mounted with the back facing the receiver such that the probe engages the block.

[0044] In some implementations, the sensor includes an adhesive on the back of the case, configured to secure the sensor to the receiver.

[0045] In some implementations, the adhesive is a pressure-sensitive adhesive.

[0046] In some implementations, the adhesive is a contact adhesive.

[0047] In some implementations, the adhesive is an anaerobic adhesive.

[0048] In some implementations, the adhesive is a multi-component adhesive.

[0049] In some implementations, the adhesive is a UV-curing adhesive.

[0050] In some implementations, the adhesive is a heat-curing adhesive.

[0051] In some implementations, the adhesive is on a double-sided tape.

[0052] In some implementations, the adhesive is a first adhesive, and the sensor includes a second adhesive on the probe, the second adhesive being movable with respect to the first adhesive and configured to secure the probe to the block.

[0053] In some implementations, the second adhesive has the same composition as the first adhesive.

[0054] In some implementations, the second adhesive has a different composition from the first adhesive.

[0055] In some implementations, the sensor includes a backing sheet backing the first adhesive and the second adhesive, such that peeling off the backing sheet exposes both the first adhesive and the second adhesive.

[0056] In some implementations, the probe is rotatably mounted such that the movement of the probe responsive to the rotation of the block around the block axis is rotation of the probe around a probe axis.

[0057] In some implementations, the probe is rotatably mounted such that the probe axis is colinear with the block axis.

[0058] In some implementations, the probe is rotatably mounted such that the probe axis is transverse to the block axis.

[0059] In some implementations, the sensor includes a switch that is electrically connected to the interface and / or that has an open state and a closed state. The switch may be operatively coupled to the probe such that (i) in the first firing mode and the second firing mode the probe is positioned such that the switch is closed, the sensor thereby activating the electrical accessory via the interface, and / or (ii) responsively to the rotation of the block around the block axis upon the lever being pivoted to select the safe mode the probe movesto open the switch, the sensor thereby ceasing to activate the electrical accessory via the interface.

[0060] In some implementations the probe is mounted such that installation of the case on the receiver engages the probe with the block in a manner in which the probe rotates responsively to rotation of the block around the block axis; and / or the sensor further includes a cam, coupled to the probe, and shaped to operate the switch responsively to rotation of the probe.

[0061] In some implementations, the switch is a normally-open switch, and the cam is shaped to hold the switch closed in the first firing mode and the second firing mode.

[0062] In some implementations, the switch is a normally-open switch, and the cam is shaped to hold the switch closed whenever the selector is not in the safe mode.

[0063] There is further provided, in accordance with some implementations, apparatus for use with an electrical accessory for a selective-fire firearm that has a receiver and a selector, the selector including (i) a block that defines a block axis and that extends transversely through the receiver, and (ii) a lever attached to the block and extending radially away from the block axis such that pivoting the lever about the block axis rotates the block around the block axis to select between a safe mode of the firearm, a first firing mode of the firearm, and a second firing mode of the firearm.

[0064] The apparatus may include a readiness-to-fire sensor. The sensor may include a case, a switch, a terminal, and / or a probe.

[0065] The case may be configured to be installed on the receiver of the firearm.

[0066] The switch may have an open state and a closed state.

[0067] The terminal may be electrically connected to the switch and electrically connectable to the electrical accessory such that (i) in the closed state of the switch, electrical power can flow through the switch and the terminal to the electrical accessory, whereas (ii) in the open state of the switch, electrical power cannot flow through the switch and the terminal to the electrical accessory.

[0068] The probe may be operatively coupled to the switch. In some implementations, the probe is mounted in a manner in which installation of the case on the receiver engages the probe with the block such that (i) in the first firing mode and the second firing mode, the probe is positioned such that the switch is closed, and / or (ii) responsively to rotation of theblock around the block axis upon the lever being pivoted to select the safe mode, the probe moves to open the switch.

[0069] In some implementations, the apparatus further includes the electrical accessory.

[0070] In some implementations, the electrical accessory is a flashlight.

[0071] In some implementations, the electrical accessory is a laser sight.

[0072] In some implementations, the electrical accessory is a component of an Identification Friend or Foe (IFF) system.

[0073] In some implementations, the electrical accessory is a transmitter.

[0074] In some implementations, the electrical accessory is a transponder.

[0075] In some implementations, the electrical accessory is a transceiver.

[0076] In some implementations, the electrical accessory is a gun safety accessory.

[0077] In some implementations, the firearm is an assault rifle.

[0078] In some implementations, the receiver is a lower receiver, and the firearm further includes an upper receiver secured to the lower receiver.

[0079] There is further provided, in accordance with some implementations, apparatus for use with an electrical accessory for a selective-fire firearm that has a receiver and a selector, the selector including (i) a block that defines a block axis and that extends transversely through the receiver, and (ii) a lever attached to the block and extending radially away from the block axis such that pivoting the lever about the block axis rotates the block around the block axis to select between a safe mode of the firearm, a first firing mode of the firearm, and a second firing mode of the firearm.

[0080] The apparatus may include a readiness-to-fire sensor. The sensor may include a case, a switch, an interface, and / or a probe.

[0081] The case may be configured to be installed on the receiver of the firearm.

[0082] The switch may have an open state and a closed state.

[0083] The interface may be connected to the switch and configured to interface with the electrical accessory such that, in the closed state but not in the open state, the sensor activates the electrical accessory.

[0084] The probe may be operatively coupled to the switch. In some implementations, the probe is mounted in a manner in which installation of the case on the receiver engages the probe with the block such that (i) in the first firing mode and the second firing mode, the probe is positioned such that the switch is closed, and / or (ii) responsively to rotation of the block around the block axis upon the lever being pivoted to select the safe mode, the probe moves to open the switch.

[0085] There is further provided, in accordance with some implementations, apparatus for use with a selective-fire firearm that has a receiver and a selector, the selector including (i) a block that defines a block axis and that extends transversely through the receiver, and (ii) a lever attached to the block and extending radially away from the block axis such that pivoting the lever about the block axis rotates the block around the block axis to select between a safe mode of the firearm, a first firing mode of the firearm, and a second firing mode of the firearm.

[0086] The apparatus may include a readiness-to-fire sensor. The sensor may include a case, configured to be installed on the receiver; and / or a probe.

[0087] The probe may be mounted in the case in a manner in which installation of the case on the receiver engages the probe with the block in a manner in which the probe moves responsively to movement of the block such that (i) in the safe mode, the sensor is in a first state, and / or (ii) in the first firing mode and the second firing mode the sensor is in a second state.

[0088] There is further provided, in accordance with some implementations, apparatus for use with an electrical accessory for a selective-fire firearm that has a grip, a receiver, and a selector, the selector including (i) a block that defines a block axis and that extends transversely through the receiver, and (ii) a lever attached to the block and extending radially away from the block axis such that pivoting the lever about the block axis rotates the block around the block axis to select between a safe mode of the firearm, a first firing mode of the firearm, and a second firing mode of the firearm.

[0089] The apparatus may include a readiness-to-fire sensor. The sensor may include a case, an interface, and / or a probe.

[0090] The case may be configured to be installed in the grip.

[0091] The interface may be configured to interface with the electrical accessory.

[0092] The probe may be operatively coupled to the interface and engageable with the block in a manner in which the probe moves responsively to rotation of the block such that, in the first firing mode and the second firing mode but not in the safe mode, the sensor activates the electrical accessory via the interface.

[0093] There is further provided, in accordance with some implementations, apparatus for use with an electrical accessory for a selective-fire firearm that has a grip, a receiver, and a selector that is operable to select between a safe mode of the firearm, a first firing mode of the firearm, and a second firing mode of the firearm.

[0094] The apparatus may include a readiness-to-fire sensor. The sensor may include a case, an interface, and / or a probe.

[0095] The case may be configured to be installed in the grip.

[0096] The interface may be configured to interface with the electrical accessory.

[0097] The probe may be operatively coupled to the interface and configured to move responsively to operation of the selector such that, in the first firing mode and the second firing mode but not in the safe mode, the sensor activates the electrical accessory via the interface.

[0098] There is further provided, in accordance with some implementations, apparatus for use with an electrical accessory for a firearm that has a stock that has a butt.

[0099] The apparatus may include a readiness-to-fire sensor. The sensor may include a case, an interface, and / or a pressure switch.

[0100] The case may be configured to be installed on the butt in a shoulder-facing position.

[0101] The interface may be configured to interface with the electrical accessory.

[0102] The pressure switch may be operatively coupled to the interface and mounted such that when the case is installed on the butt, pressure on the sensor closes the pressure switch such that the sensor activates the electrical accessory via the interface.

[0103] There is further provided, in accordance with some implementations, a method for use with a selective-fire firearm that has a receiver and a selector, the selector including (i) a block that defines a block axis and that extends transversely through the receiver, and (ii) a lever attached to the block and extending radially away from the block axis such that pivoting the lever about the block axis rotates the block around the block axis to selectbetween a safe mode of the firearm, a first firing mode of the firearm, and a second firing mode of the firearm.

[0104] The method may include installing, on the firearm, an electrical accessory for the firearm.

[0105] The method may include installing, on the receiver, a case of a readiness-to-fire sensor such that: (i) an interface of the receiver interfaces with the electrical accessory, and / or (ii) a probe of the sensor engages the block in a manner in which the probe moves responsively to movement of the block such that, in the first firing mode and the second firing mode but not in the safe mode, the sensor activates the electrical accessory via the interface.

[0106] There is further provided, in accordance with some implementations, a method for use with an electrical accessory for a selective-fire firearm that has a receiver and a selector, the selector including (i) a block that defines a block axis and that extends transversely through the receiver, and (ii) a lever attached to the block and extending radially away from the block axis such that pivoting the lever about the block axis rotates the block around the block axis to select between a safe mode of the firearm, a first firing mode of the firearm, and a second firing mode of the firearm.

[0107] The method may include connecting an interface of a readiness-to-fire sensor to the electrical accessory.

[0108] The method may include installing a case of the sensor on the receiver such that a probe of the sensor engages the block in a manner in which the probe moves responsively to movement of the block such that, in the first firing mode and the second firing mode but not in the safe mode, the sensor activates the electrical accessory via the interface.

[0109] There is further provided, in accordance with some implementations, a method for use with an electrical accessory for a selective-fire firearm that has a receiver and a selector, the selector including (i) a block that defines a block axis and that extends transversely through the receiver, and (ii) a lever attached to the block and extending radially away from the block axis such that pivoting the lever about the block axis rotates the block around the block axis to select between a safe mode of the firearm, a first firing mode of the firearm, and a second firing mode of the firearm.

[0110] The method may include verifying that the selector is in the safe mode.

[0111] The method may include, while the selector remains in its safe mode, installing a case of a sensor on the receiver such that a probe of the sensor engages the block in a manner in which the probe moves responsively to movement of the block such that (i) in the safe mode, the sensor is in a first state, and / or (ii) in the first firing mode and the second firing mode the sensor is in a second state.

[0112] There is further provided, in accordance with some implementations, apparatus for use with an electrical accessory for a selective-fire firearm that has a receiver and a selector, the selector including (i) a block that defines a block axis and that extends transversely through the receiver, and (ii) a lever attached to the block and extending radially away from the block axis such that pivoting the lever about the block axis rotates the block around the block axis to select between a safe mode of the firearm, a first firing mode of the firearm, and a second firing mode of the firearm, the apparatus including a readiness-to-fire sensor that includes a case, an interface, and / or a probe.

[0113] The case may be configured to be installed on the receiver.

[0114] The interface may be configured to interface with the electrical accessory.

[0115] The probe may be operatively coupled to the interface and mounted in a manner in which installation of the case on the receiver engages the probe with the selector in a manner in which the probe moves responsively to rotation of the block such that, in the first firing mode and the second firing mode but not in the safe mode, the sensor activates the electrical accessory via the interface.

[0116] In some implementations, the lever is a first lever, and the selector includes a second lever opposite the first lever, and the probe is mounted in a manner in which installation of the case on the receiver engages the probe with the second lever.

[0117] In some implementations, the probe is mounted in a manner in which installation of the case on the receiver engages the probe with the block.

[0118] There is further provided, in accordance with some implementations, apparatus for use with an electrical accessory for a selective-fire firearm that has a receiver and a selector, the selector including (i) a block that defines a block axis and that extends transversely through the receiver, and (ii) a lever attached to the block and extending radially away from the block axis such that pivoting the lever about the block axis rotates the block around the block axis to select between a safe mode of the firearm, a first firing mode of the firearm,and a second firing mode of the firearm, the apparatus including a readiness-to-fire sensor that includes: a case, configured to be installed on the receiver; a switch, having an open state and a closed state; a terminal, electrically connected to the switch and electrically connectable to the electrical accessory such that: in the closed state of the switch, electrical power can flow through the switch and the terminal to the electrical accessory, whereas in the open state of the switch, electrical power cannot flow through the switch and the terminal to the electrical accessory; and / or a probe, operatively coupled to the switch and mounted in a manner in which installation of the case on the receiver engages the probe with the selector such that: in the first firing mode and the second firing mode, the probe is positioned such that the switch is closed, and / or responsively to rotation of the block around the block axis upon the lever being pivoted to select the safe mode, the probe moves to open the switch.

[0119] There is further provided, in accordance with some implementations, apparatus for use with an electrical accessory for a selective-fire firearm that has a receiver and a selector, the selector including (i) a block that defines a block axis and that extends transversely through the receiver, and (ii) a lever attached to the block and extending radially away from the block axis such that pivoting the lever about the block axis rotates the block around the block axis to select between a safe mode of the firearm, a first firing mode of the firearm, and a second firing mode of the firearm, the apparatus including a readiness-to-fire sensor that includes: a case, configured to be installed on the receiver; a switch, having an open state and a closed state; an interface, connected to the switch and configured to interface with the electrical accessory such that, in the closed state but not in the open state, the sensor activates the electrical accessory; and / or a probe, operatively coupled to the switch and mounted in a manner in which installation of the case on the receiver engages the probe with the selector such that: in the first firing mode and the second firing mode, the probe is positioned such that the switch is closed, and / orresponsively to rotation of the block around the block axis upon the lever being pivoted to select the safe mode, the probe moves to open the switch.

[0120] There is further provided, in accordance with some implementations, apparatus for use with a selective-fire firearm that has a receiver and a selector, the selector including (i) a block that defines a block axis and that extends transversely through the receiver, and (ii) a lever attached to the block and extending radially away from the block axis such that pivoting the lever about the block axis rotates the block around the block axis to select between a safe mode of the firearm, a first firing mode of the firearm, and a second firing mode of the firearm, the apparatus including a readiness-to-fire sensor that includes: a case, configured to be installed on the receiver; and / or a probe, mounted in the case in a manner in which installation of the case on the receiver engages the probe with the selector in a manner in which the probe moves responsively to movement of the block such that: in the safe mode, the sensor is in a first state, and / or in the first firing mode and the second firing mode the sensor is in a second state.

[0121] There is further provided, in accordance with some implementations, apparatus for use with an electrical accessory for a selective-fire firearm that has a grip, a receiver, and a selector, the selector including (i) a block that defines a block axis and that extends transversely through the receiver, and (ii) a lever attached to the block and extending radially away from the block axis such that pivoting the lever about the block axis rotates the block around the block axis to select between a safe mode of the firearm, a first firing mode of the firearm, and a second firing mode of the firearm, the apparatus including a readiness-to-fire sensor that includes: a case, configured to be installed in the grip; an interface, configured to interface with the electrical accessory; and / or a probe, operatively coupled to the interface and engageable with the selector in a manner in which the probe moves responsively to rotation of the selector such that, in the first firing mode and the second firing mode but not in the safe mode, the sensor activates the electrical accessory via the interface.

[0122] There is further provided, in accordance with some implementations, apparatus for use with an electrical accessory for a selective-fire firearm that has a grip, a receiver, and a selector that is operable to select between a safe mode of the firearm, a first firing mode ofthe firearm, and a second firing mode of the firearm, the apparatus including a readiness-to- fire sensor that includes: a case, configured to be installed in the grip; an interface, configured to interface with the electrical accessory; and / or a probe, operatively coupled to the interface, and configured to move responsively to operation of the selector such that, in the first firing mode and the second firing mode but not in the safe mode, the sensor activates the electrical accessory via the interface.

[0123] There is further provided, in accordance with some implementations, apparatus for use with an electrical accessory for a firearm that has a stock that has a butt, the apparatus including a readiness-to-fire sensor that includes: a case, configured to be installed on the butt in a shoulder-facing position; an interface, configured to interface with the electrical accessory; and / or a pressure switch, operatively coupled to the interface and mounted such that when the case is installed on the butt, pressure on the sensor closes the pressure switch such that the sensor activates the electrical accessory via the interface.

[0124] There is further provided, in accordance with some implementations, a method for use with a selective-fire firearm that has a receiver and a selector, the selector including (i) a block that defines a block axis and that extends transversely through the receiver, and (ii) a lever attached to the block and extending radially away from the block axis such that pivoting the lever about the block axis rotates the block around the block axis to select between a safe mode of the firearm, a first firing mode of the firearm, and a second firing mode of the firearm, the method including: on the firearm, installing an electrical accessory for the firearm; and / or on the receiver, installing a case of a readiness-to-fire sensor such that: an interface of the receiver interfaces with the electrical accessory, and / or a probe of the sensor engages the selector in a manner in which the probe moves responsively to movement of the selector such that, in the first firing mode and the second firing mode but not in the safe mode, the sensor activates the electrical accessory via the interface.

[0125] There is further provided, in accordance with some implementations, a method for use with an electrical accessory for a selective-fire firearm that has a receiver and a selector, the selector including (i) a block that defines a block axis and that extends transversely through the receiver, and (ii) a lever attached to the block and extending radially away fromthe block axis such that pivoting the lever about the block axis rotates the block around the block axis to select between a safe mode of the firearm, a first firing mode of the firearm, and a second firing mode of the firearm, the method including: connecting an interface of a readiness-to-fire sensor to the electrical accessory; and / or installing a case of the sensor on the receiver such that a probe of the sensor engages the selector in a manner in which the probe moves responsively to movement of the selector such that, in the first firing mode and the second firing mode but not in the safe mode, the sensor activates the electrical accessory via the interface.

[0126] There is further provided, in accordance with some implementations, a method for use with an electrical accessory for a selective-fire firearm that has a receiver and a selector, the selector including (i) a block that defines a block axis and that extends transversely through the receiver, and (ii) a lever attached to the block and extending radially away from the block axis such that pivoting the lever about the block axis rotates the block around the block axis to select between a safe mode of the firearm, a first firing mode of the firearm, and a second firing mode of the firearm, the method including: verifying that the selector is in the safe mode; and / or while the selector remains in the safe mode, installing a case of a sensor on the receiver such that a probe of the sensor engages the selector in a manner in which the probe moves responsively to movement of the block such that: in the safe mode, the sensor is in a first state, and / or in the first firing mode and the second firing mode the sensor is in a second state.

[0127] In some implementations, the lever is a first lever, and the selector includes a second lever opposite the first lever, and the probe is mounted to engage the second lever.

[0128] In some implementations, the probe is mounted to engage the block.

[0129] There is further provided, in accordance with some implementations, apparatus for use with an electrical accessory for a selective-fire firearm that has a receiver and a selector, the selector including (i) a block that defines a block axis and that extends transversely through the receiver, and (ii) a lever attached to the block and extending radially away from the block axis such that pivoting the lever about the block axis rotates the block around the block axis to select between a safe mode of the firearm, a first firing mode of the firearm,and a second firing mode of the firearm, the apparatus including a readiness-to-fire (RTF) sensor.

[0130] The RTF sensor may include a case, and interface, and / or a probe.

[0131] The case may be mountable (e.g. installable) on the receiver of the firearm.

[0132] The interface may be configured to interface with the electrical accessory.

[0133] The probe may be operatively coupled to the interface.

[0134] The sensor may be configured to be installed on the receiver in a manner that places the probe in communication with the selector such that, in the first firing mode and the second firing mode but not in the safe mode, the sensor activates the electrical accessory via the interface.

[0135] In some implementations, the probe is a mechanical probe, configured to be placed in mechanical communication with the selector, and the sensor is configured to be installed on the receiver in a manner that mechanically engages the probe with the selector.

[0136] In some implementations, the lever is a first lever, and the selector includes a second lever opposite the first lever, and the sensor is configured to be installed on the receiver in a manner that mechanically engages the probe with the second lever.

[0137] In some implementations, the probe defines a groove dimensioned to receive the second lever upon installation of the sensor on the receiver.

[0138] In some implementations, the probe is configured to mechanically engage the block, and the sensor is configured to be installed on the receiver in a manner that mechanically engages the probe with the block.

[0139] In some implementations, the probe is a magnetic probe, configured to be placed in magnetic communication with the selector, and the sensor is configured to be installed on the receiver in a manner that places the probe in magnetic communication with the selector.

[0140] There is further provided, in accordance with some implementations, apparatus for use with a selective-fire firearm that has a receiver, a safe mode, a first firing mode, and a second firing mode, the apparatus including a selector lever.

[0141] The selector lever may include a lug, a magnet, and / or a thumbswitch.

[0142] The lug may define a fulcrum of the lever.

[0143] The magnet may be mounted eccentrically with respect to the fulcrum.

[0144] The thumbswitch may extend from the lug.

[0145] The lever may be configured to be installed on the receiver such that pivoting the thumbswitch around the fulcrum (i) rotates the lug about the fulcrum in a manner that selects between the safe mode, the first firing mode, and the second firing mode, and / or (ii) revolves the magnet around the fulcrum.

[0146] In some implementations: the apparatus includes a selector, the lever being a lever of the selector, the selector further includes a block that defines a block axis, the lug is fastened to an end of the block such that the fulcrum lies on the block axis, and the thumbswitch extends radially away from the block axis such that pivoting the thumbswitch around the block axis (i) rotates the block about the block axis, and (ii) revolves the magnet around the block axis, and / or the block is configured to be disposed transversely through the receiver such that rotation of the block about the block axis selects between the safe mode, the first firing mode, and the second firing mode.

[0147] In some implementations, the magnet is mounted on the lug.

[0148] In some implementations, the magnet is mounted on the thumbswitch.

[0149] In some implementations, the lever is for use as a second lever of a selector of the firearm, the selector including (i) a block that defines a block axis and that extends transversely through the receiver, and (ii) a first lever attached to the block and extending radially away from the block axis such that pivoting the first lever about the block axis rotates the block around the block axis to select between the safe mode, the first firing mode, and the second firing mode; and / or the lug is configured to be fastened to an opposite end of the block from the first lever such that the fulcrum lies on the block axis, the thumbswitch extends radially away from the block axis, and pivoting the thumbswitch around the fulcrum (i) rotates the block around the block axis to select between the safe mode, the first firing mode, and the second firing mode, and (ii) revolves the magnet around the block axis.

[0150] In some implementations, the lever is a replacement second lever for the selector, for replacing an original second lever of the selector.

[0151] In some implementations, the lug defines a threaded bolt via which the lug is fastenable to the opposite end of the block.

[0152] In some implementations, the lug defines a ring through which a threaded bolt is receivable to fasten the lug to the opposite end of the block.

[0153] There is further provided, in accordance with some implementations, a system for use with an electrical accessory for the firearm, the system including a selector lever that comprises a magnet, and an RTF sensor compatible with the selector lever.

[0154] The RTF sensor may include a case; an interface, configured to interface with the electrical accessory; and / or a probe.

[0155] The RTF sensor may be configured to be installed on the receiver in a manner in which (i) the probe is positioned to distinguish between positions of the magnet, and / or (ii) the interface is in communication with the selector such that, in the first firing mode and the second firing mode but not in the safe mode, the sensor activates the electrical accessory via the interface.

[0156] In some implementations, the probe includes a magnetic switch.

[0157] In some implementations, the system further includes the electrical accessory.

[0158] The present invention will be more fully understood from the following detailed description of applications thereof, taken together with the drawings, in which:BRIEF DESCRIPTION OF THE DRAWINGS

[0159] Figs. 1A-B are schematic illustrations of a selective-fire firearm, in accordance with some implementations;

[0160] Figs. 2A-C and 3A-B are schematic illustrations of a readiness-to-fire sensor, in accordance with some implementations;

[0161] Figs. 4 and 5 are schematic illustrations of example implementations of the readiness- to-fire sensor installed on the firearm;

[0162] Figs. 6A-C are schematic illustrations of a readiness-to-fire sensor, in accordance with some implementations;

[0163] Fig. 7 is a schematic illustration of a readiness-to-fire sensor, in accordance with some implementations;

[0164] Fig. 8 is a schematic illustration of a readiness-to-fire sensor, in accordance with some implementations;

[0165] Figs. 9-10 are schematic illustrations of a firearm and a readiness-to-fire sensor for use with the firearm, in accordance with some implementations; and

[0166] Figs. 11-14 are schematic illustrations of a sensor, and selectors and / or selector levers for use therewith, in accordance with some implementations.DETAILED DESCRIPTION OF EMBODIMENTS

[0167] Figs. 1A-B are schematic illustrations of a selective-fire firearm 20, in accordance with some implementations. Like many firearms, firearm 20 has a barrel 22, a trigger 24, a grip (or handle) 30, a handguard 26, a stock 40, and a receiver 50. Receiver 50 may be a lower receiver, and firearm 20 may also have an upper receiver 60 that is secured to the lower receiver. Being a selective-fire firearm (e.g. an assault rifle), firearm 20 has a selector 70 via which the operator can select (i.e. switch the firearm) between a safe mode and one or more firing modes. In the example shown, firearm 20 has two firing modes (e.g. semiautomatic and automatic), and therefore selector 70 can be used to select between (i) the safe mode, (ii) the semi-automatic mode, and (iii) the (fully) automatic mode.

[0168] Fig. 1A is a left-side view of firearm 20, and Fig. IB is a right-side view of the firearm. Each of these figures has an inset that shows a respective perspective view of selector 70. Selector 70 comprises a block 72 that defines a block axis axl - e.g. the block is elongate and the block axis is the long axis of the block. Block 72 extends transversely through receiver 50 - e.g. transverse to the long axis of firearm 20, such as transverse to barrel 22. Selector 70 also comprises a lever 74 that is attached to block 72, and that extends radially away from block axis axl - e.g. lever 74 may be substantially orthogonal to block 72. Selector 70 is operated by pivoting lever 74 about block axis axl, which rotates block 72 around the block axis, thereby changing the shape and / or faces of block 72 that are presented to the internal firing mechanism of firearm 20, which effects the mode change.

[0169] Figs. 1A-B show firearm 20 having an electrical accessory 80. Accessory 80 may be mounted on the firearm - e.g. on receiver 50 or 60. In the example shown, accessory 80 is mounted on handguard 26 - e.g. pointing in the direction of fire. Accessory 80 may be or may comprise one or more of: a flashlight, a laser sight, a scope (e.g. a low-light scope), a component of an Identification Friend or Foe (IFF) system, a transmitter, a transceiver, a transponder, and a gun-safety accessory.

[0170] Accessory 80 is typically powered by a power source (e.g. a battery) 90 that is mounted on firearm 20. Power source 90 may be external to accessory 80 or, as shown, may be housed by the accessory. Irrespective of where power source 90 is mounted, the duration for which it is able to power accessory 80 is affected by consumption of its power by theaccessory. This may be particularly important during extended periods of use in locations in which charging ports and / or fresh batteries are unavailable. In some implementations - e.g. for some types of accessory 80 - powering the accessory only when firearm 20 is ready to fire may advantageously reduce power consumption by the accessory - e.g. power consumption when the function of the accessory is not required.

[0171] Reference is now made to Figs. 2A-C, which are schematic illustrations of an RTF sensor 100, in accordance with some implementations. Sensor 100 comprises a case 110, an interface (or port) 120, and a probe 130. Figs. 2A-B are, respectively, front and back perspective views of sensor 100. Fig. 2C shows a partial cutaway of case 110 in order to view some of the componentry of sensor 100.

[0172] Case 110 is configured to be installed on (e.g. secured to) receiver 50 of firearm 20. This is described in more detail hereinbelow. Interface 120 is configured to interface with electrical accessory 80 - e.g. wiredly or wirelessly. This is also described in more detail hereinbelow.

[0173] Probe 130 is operatively coupled to interface 120, and is mounted (e.g. within case 110) such that installation of the case on the receiver engages the probe with block 72 of selector 70. This is discussed in more detail hereinbelow. However, briefly, the nature of probe 130 and its engagement with block 72 is that the probe moves (e.g. rotates) responsively to rotation of the block.

[0174] Sensor 100 is configured such that this movement of probe 130 means that (i) when selector 70 is its safe mode, accessory 80 is inactive (e.g. the sensor does not activate the accessory), but (ii) when the selector is out of its safe mode (e.g. when it is in any of its firing modes), the electrical accessory is active (e.g. the sensor activates the accessory). It is to be noted that, in some implementations, the terms 'operate' and 'operative' may be more appropriate than 'active' and 'activate'. For example, the accessory may be inoperative (e.g. the sensor may be configured to not operate the accessory) when the selector is in its safe mode, but operative (e.g. the sensor may be configured to operate the accessory) when the selector is out of its safe mode.

[0175] In some implementations, such activation of accessory 80 is or includes powering- or switching-on of the accessory. For example, interface 120 may be or may comprise an electrical terminal via which sensor 100 is configured power accessory 80. In the example shown, sensor 100 is configured to power accessory 80 via the interface / terminal bytransferring power from power source 90 to the accessory - e.g. sensor 100 may serve as a power switch (e.g. an external power switch) for the accessory.

[0176] In some implementations, such activation of accessory 80 is or includes wiredly or wirelessly transmitting a signal to the accessory, to which the accessory responds by becoming activated.

[0177] In some implementations, and as shown, case 110 has a back 112, and probe 130 is mounted such that it protrudes through the back. Probe 130 may be flush with back 112 or may protrude beyond the back. In such implementations, case 110 is configured to be mounted with back 112 facing receiver 50 such that probe 130 engages block 72.

[0178] Reference is additionally made to Figs. 3A-B. As noted hereinabove, case 110 is configured to be installed on (e.g. secured to) receiver 50 of firearm 20. Figs. 3A-B are schematic illustrations of example implementations in which this mounting is achieved using an adhesive 102 disposed on back 112 of case 110. However, it is to be understood that other means, such as clips or straps may be used. Fig. 3A shows a sensor 100a (e.g. a variant of sensor 100) in which adhesive 102 is disposed on back 112 of case 110 while probe 130 is adhesive-free. Fig. 3B shows a sensor 100b (e.g. a variant of sensor 100) in which a first adhesive 102' (or portion of adhesive 102) is disposed on back 112 of case 110, and a second adhesive 102" (or portion of adhesive 102) is disposed on probe 130 in order to facilitate engagement of the probe with block 72 of selector 70.

[0179] Adhesive 102" is separate from and movable with respect to adhesive 102' so as not to interfere with the functioning of probe 130. Nonetheless, sensor 100b may be provided with a single unitary backing sheet that can be peeled off to expose both adhesive 102' and adhesive 102". Irrespective of whether an adhesive is disposed on probe 130, the adhesive on back 112 of case 110 may be arranged to seal probe 130 from the environment - e.g. in order to keep the probe and / or the interior of sensor 100 clean and dry. In the examples shown, this is achieved by adhesive 102 or 102' being arranged to define a perimeter around probe 130 - e.g. at or close to the edge of back 112.

[0180] Adhesive 102 (e.g. adhesive 102' and / or adhesive 102") may comprise a pressuresensitive adhesive (e.g. on double-sided tape or pad), a contact adhesive, an anaerobic adhesive, a multi-component adhesive, a UV-curing adhesive, a heat-curing adhesive, or any other suitable adhesive. In some implementations, adhesive 102' is the same as (i.e. has the same composition as) adhesive 102". In some implementations, adhesive 102' is differentfrom (i.e. has the same composition as) adhesive 102" - e.g. to due to the adhesive properties required for securing case 110 to receiver 50 being different from those required for maintaining engagement between probe 130 and block 72.

[0181] Reference is additionally made to Figs. 4 and 5, which are schematic illustrations of example implementations of sensor 100 installed on firearm 20.

[0182] As shown, sensor 100 may be configured to be installed in a manner that does not obstruct or otherwise interfere with selector 70. For example, and as shown, sensor 100 may be configured for installation on the side of the receiver opposite from lever 74 of the selector. Similarly, probe 130 may engage selector 70 in a way that does not interfere with normal use and / or movement of the selector. For example, and as shown, probe 130 may engage block 72 of the selector rather than the lever of the selector. Advantageously, this means that the operator of firearm 20 need not change his / her behavior or habits with respect to the firearm, and need not interact directly or consciously with accessory 80. Rather, the operator indirectly operates accessory 80 through normal use of selector 70.

[0183] Some selectors are double-ended or ambidextrous, having a lever at each end of their block. Therefore, the scope of the present disclosure includes variants of sensor 100 whose probes are configured to engage one of the levers of the selector.

[0184] Fig. 4 shows a sensor 100c (e.g. a variant of sensor 100) which has a wired interface 120a (e.g. a variant of interface 120) - e.g. comprising an electrical or electronic terminal. Interface 120a is connected or connectable to accessory 80 via a wire or cable 140 that is secured along firearm 20. It is to be understood that the presence of a single wire / cable 140 is purely illustrative, and that sensor lOO / lOOc may be used in situations in which multiple mounted accessories are connected to the sensor, in which accessory 80 has multiple subcomponents (which may be connected to each other by wires / cables), and / or in which power source 90 is connected to the sensor independently of the accessory (e.g. via a separate wire / cable).

[0185] Fig. 5 shows a sensor lOOd (e.g. a variant of sensor 100) which has a wireless interface 120b (e.g. a variant of interface 120) - e.g. comprising a transmitter and / or an antenna. Interface 120b is connected or connectable to accessory 80 via wireless (e.g. electromagnetic) signals 142.

[0186] Referring back to Figs. 1A-B, block 72 of selector 70 terminates in a face 76 that is exposed at and / or accessible from the opposite side of receiver 50 from lever 74. For thevariants of sensor 100 shown in Figs. 2A-5, the case is configured to be installed on an opposite side of receiver 50 from lever 74, and probe 130 engages face 76 of block 72. Some selectors, such as selector 70 shown, have a face 76 that is substantially featureless (e.g. smooth). For such selectors, probe 130 may be configured to engage block 72 (e.g. face 76 thereof) via friction, or via adhesion - e.g. facilitated by adhesive 102". Some selectors have a face 76 that has geometric features, such as an indent (e.g. a hex or square) or a thread. For such selectors, probe 130 may be configured to engage block 72 (e.g. face 76 thereof) via mating geometry (e.g. via threading).

[0187] Reference is again made to Fig. 2C. In some implementations, and as shown, sensor 100 comprises a spring 104 that facilitates engagement between probe 130 and block 72. For example, while case 110 remains mounted on receiver 50, spring 104 may press the probe against the block - e.g. by biasing the probe to protrude from back 112.

[0188] As noted hereinabove, sensor 100 may function by probe 130 moving responsively to rotation of block 72. In the example shown, this movement of probe 130 is rotation. Thus, probe 130 defines and / or is rotatably mounted to define a probe axis ax2 around which the probe rotates responsively to rotation of block 72. Probe 130 is coupled to a cam 132 - e.g. fixedly coupled, such as by the probe and the cam being a unitary component. Cam 132 may rotate or revolve with probe 130 around probe axis ax2. Fig. 2C includes an inset that shows probe 130 and cam 132. Sensor 100 may comprise a switch 106 with which cam 132 is operatively coupled such that the cam is configured to actuate the switch - e.g. by pushing contact (or contact-actuator) 108. In the example shown, switch 106 is a normally-open switch, and cam 132 is configured to close the switch. Thus, in certain rotational positions of probe 130, cam 132 holds switch 106 closed. The shape of cam 132, and the mounting of sensor 100, can be such that the cam holds switch 106 closed whenever selector 70 is not in its safe mode - e.g. when the selector is in any of its firing modes. Switch 106 is electrically or electronically connected to interface 120. In this manner, sensor 100 is configured to activate accessory 80 whenever selector 70 is not in its safe mode - e.g. when the selector is in any of its firing modes.

[0190] It is to be noted that, in some implementations, switch 106 may be a normally -closed switch that the cam is configured to open, mutatis mutandis.

[0191] Independently of whether switch 106 is itself a normally-open switch or a normally- closed switch, sensor 100 may be configured to default to a closed / operating / activating state (e.g. such that current flows to accessory 80) or to an open / non-operating / non-activatingstate (e.g. such that no current flows to accessory 80), depending on the particular implementation and / or the nature of accessory 80. For example, in some implementations it may be preferable that, in the unlikely event of sensor 100 failing or probe 130 becoming disengaged from block 72, sensor 100 defaults to its closed / operating / activating state in order that accessory 80 continues to function - e.g. despite the loss of the power-saving effect of the sensor. On the other hand, in some implementations, it may be preferable that, in such an event, sensor 100 defaults to its open / non-operating / non-activating state in order that accessory 80 ceases to function - e.g. in order to avoid wasting power and / or if operation of the accessory is otherwise disadvantageous.

[0192] In some applications, in order that probe 130 and / or cam 132 be appropriately positioned (e.g. rotationally positioned) for the various states of selector 70 and thereby appropriately activate / inactivate accessory 80, sensor 100 may be installed while selector 70 is in a known mode (and block 72 is thereby in a known rotational position). For example, sensor 100 may be provided in its activating state (e.g. with switch 106 closed), and may be installed while selector 70 is in its safe mode.

[0193] There is therefore provided, in accordance with some implementations, a method comprising: (i) verifying that the selector of a firearm is in the safe mode; and (ii) while the selector remains in the safe mode, installing the case of the sensor on the receiver of the firearm such that the probe of the sensor engages the block of the selector.

[0194] In some implementations, a kit is provided that includes sensor 100 and a jig (not shown) that is shaped complementarity with respect to firearm 20 (e.g. with respect to receiver 50) and configured to guide positioning of case 110 for installation on the receiver - e.g. to ensure engagement of block 72 by probe 130. The jig may be configured to be temporarily secured to the firearm (e.g. to its receiver) such as via a snap-fit or a strap. In some implementations, the kit may be provided with sensor 100 (e.g. case 110) pre-mounted on the jig, and may be configured to be removed from the jig after installation of the case on the firearm - e.g. the jig may be removable from the firearm and the sensor, leaving the sensor installed on the firearm in the appropriate position.

[0195] In the example shown, probe 130 is rotatably mounted such that, when sensor 100 is installed, probe axis ax2 is colinear with block axis axl. However, in other implementations, probe 130 may be rotatably mounted such that probe axis ax2 is not colinear with block axis axl - e.g. such that the probe axis is parallel, transverse, or oblique with respect to the block axis.

[0196] In some implementations, sensor 100 includes a gear, sprocket, or other mechanism that provides a mechanical advantage or otherwise alters the magnitude of movement (e.g. rotation) of probe 130 or cam 132. Such a mechanism may be used, for example, to reduce any resistance that probe 130 may give to rotation of selector 70 or, alternatively, to amplify the magnitude of movement of probe 130 responsively to a given magnitude of movement of block 72.

[0197] In some implementations, and as shown, sensor 100 comprises an override (e.g. an override button or switch) 114 that is manually actuatable to activate accessory 80 - e.g. irrespective of a state of the sensor (e.g. independently of a position of probe 130). This may be advantageous for testing accessory 80, power source 90, or the system overall, or in particular situations in which it is desired to benefit from accessory 80 even when selector 70 is in its safe mode.

[0198] In some implementations, a system is provided that comprises accessory 80 and sensor 100 - e.g. pre-configured for use with each other.

[0199] As noted hereinabove, although probe 130 is shown as having a probe axis that is colinear with block axis axl, in some implementations a sensor (e.g. a variant of sensor 100) may have a probe (e.g. a variant of probe 130) that has a probe axis that is not colinear with the block axis. Sensor 100c, illustrated in Fig. 6, is such a variant of sensor 100.

[0200] Reference is now made to Figs. 6A-C, which are schematic illustrations of a sensor 100c, in accordance with some implementations. Sensor 100c is a variant of sensor 100, and any of its components and / or features may be utilized in any of the other sensors described herein, mutatis mutandis.

[0201] Sensor 100c comprises a case I lOe that has a back 112e, a probe 130e, and an override 114e. Sensor 100c may also comprise a switch (not visible in Figs. 6A-C) such as switch 106. Sensor 100c may also comprise an interface (not visible in Figs. 6A-C) such as interface 120.

[0202] Figs 6A and 6B are respective perspective views of sensor 100c. Fig. 6C shows sensor 100c, in cutaway, with probe 130e engaged with face 76 of block 72 of selector 70.

[0203] In general, sensor 100c is as described for sensor 100, except that it is configured such that its probe axis ax2' (i.e. the axis about which probe 130e rotates) is not colinear with block axis axl. For example and as shown, axis ax2' may be transverse to axis axl. Curved arrows are used in Fig. 6C to indicate the way in which block 72 and probe 130e rotate.

[0204] Sensor lOOe may comprise a cam 132e that serves the same function as cam 132 described hereinabove - i.e. to actuate the switch of the sensor responsively to movement of probe 130e. As for probe 130 and cam 132, probe 130e may be fixedly coupled to cam 132e, such as by the probe and the cam being a unitary component. In some implementations, and as shown, a disc-like structure may be shaped to define probe 130e and cam 132e. In some such implementations, and as shown, a rim of the disc-like structure may serve as the part of the probe that engages block 72.

[0205] Reference is now made to Figs. 9-10, which are schematic illustrations of a firearm 20f and an RTF sensor lOOf for use with the firearm, in accordance with some implementations. Although RTF sensors described hereinabove are described as having a probe 130 that engages block 72 of a selector, it is to be understood that the scope of the disclosure includes RTF sensors whose probe engages and / or interacts with a lever of the selector. This may be advantageous, for example, in implementations in which the selector is a double-levered (e.g. ambidextrous) selector, such as selector 70f, whose block may not terminate in a face such as face 76 described hereinabove. Firearm 20f may be as described for firearm 20 except that (e.g. may be a variant of firearm 20 in which) its selector is doublelevered selector 70f.

[0206] Sensor lOOf may be as described for sensor 100 except that (e.g. may be a variant of sensor 100 in which) its probe 130f is shaped and / or dimensioned to engage with one of the levers of double-levered selector 70f. Sensor lOOf (e.g. its case I lOf) is therefore configured to be installed on receiver 50 in a manner that mechanically engages probe 130f with one of the levers. The choice of levers (e.g. the choice of the side of the firearm on which the sensor is installed) may be according to the handedness of the individual who will use the firearm - e.g. the opposite side to the lever that will be used by the individual, which is thus left exposed and normally functional.

[0207] In the example shown, when selector 70f is in either of the firing modes (semiautomatic or automatic) the probe 130f of sensor 100 is pushed by lever 74 (frames B and C), whereas it is not pushed when the selector is in the safe mode (frame A). The pushing of probe 130f holds the switch (not shown) of sensor 130f closed, thereby activating accessory 80 whenever firearm 20f is ready to fire.

[0208] Probe 130f may be a cantilever that is pushed to deflect by lever 74. Such a cantilevered probe may have (e.g. may define) multiple tongues that interact with different parts of lever 74. In the example shown, probe 130f has (e.g. defines) (1) a first tongue 134that is shaped and positioned to be pushed by a lug 73 of lever 74 (e.g. by a pointer 78 defined by the lug) when selector 70f is in the semi-automatic firing mode (frame B), and (2) a second tongue 136 that is shaped and positioned to be pushed by a thumbswitch 75 of the lever when the selector is in the automatic firing mode (frame C). However, it is to be understood that other configurations are also possible.

[0209] It is also to be understood that a rotatable probe, analogous to probe 130 described hereinabove, may be shaped to receive or otherwise mechanically engage a lever of a double- ended selector (e.g. rather than a block of the selector).

[0210] Reference is now made to Fig. 7, which is a schematic illustration of a sensor 200, in accordance with some implementations. Mutatis mutandis, sensor 200 may have components and / or functionality described for sensor 100, and / or may be used as described for sensor 100. However, rather than being configured for installation on receiver 50 and engaging face 76 of block 72, sensor 200 has a case 210 that is configured to be installed inside grip 30 of firearm 20, and has a probe 230 that is configured to engage block 72 from this position - e.g. through the top of the grip and the bottom of receiver 50. In some implementations, a specialized grip is provided that includes sensor 200, and that is configured to replace the existing grip of the firearm. Inter alia, sensor 200 may be useful in implementations in which the firearm has a double-levered selector such as selector 7 Of - e.g. being installable without obstructing either of the levers of the selector.

[0211] Reference is now made to Fig. 8. In some implementations, sensor 100, 200 may activate / operate / power accessory 80 responsively to more than the position of selector 70 alone. For example, a butt-mounted sensor 300 may be provided, which may sense pressure on butt 42 of stock 40. This pressure may be indicative of contact with the shoulder of the operator - e.g. that firearm 20 is being held in an active pose. A system may include sensor 300 in addition to sensor 100 or 200, and may activate / operate / power accessory 80 responsively to RTF indications from both sensors - e.g. may require both an indication that selector 70 is out of its safe mode, and an indication that the firearm is being held in an active pose. That is, in such implementations, shoulder contact of butt 42 is necessary but insufficient for an RTF indication in the absence of selector 70 being out of its safe mode.

[0212] In some implementations, sensor 300 may be used without sensor 100 or sensor 200, such that activation / operation / powering of accessory 80 is dependent solely on shoulder contact of butt 42. That is, in such implementations, shoulder contact of butt 42 is necessary and sufficient for an RTF indication.

[0213] Sensor 300 may have a case 310 that is configured for installation on butt 42, or that may be configured to replace the existing butt of the firearm. Sensor 300 may comprise a probe 330 that acts as a pressure sensor or button, and that is exposed through case 310 in order to be contacted by the shoulder of the operator. In alternative implementations, component 330 is a post on which component 310 is mounted, and sensor detects pressing of component 310 toward butt 42, mutatis mutandis.

[0214] Reference is now made to Figs. 11-14, which are schematic illustrations of a sensor 100g, and selectors and / or selector levers for use therewith, in accordance with some implementations. Whereas sensor 100 and other variants thereof described herein are configured to mechanically engage and / or determine a position of a selector, sensor 100g is configured to magnetically engage and / or determine a position of a selector. As shown in Fig. 11, sensor 100g may be installed without physical contact with the selector.

[0215] The selector itself may include (or have mounted thereon) a magnet 71, which (e.g. whose position) is sensed by sensor 100g. More specifically, via sensing of magnet 71, sensor 100g may distinguish between (i) a position of the magnet (and therefore the rotational position of the selector) that corresponds to the safe mode, and (ii) a position that corresponds to a firing mode (e.g. automatic or semi-automatic), and may activate accessory 80 only when in the firing mode. This is achieved by cooperative positioning of the magnet and the sensor - e.g. a given sensor and a given magnet position (e.g. selector) may be provided as a cooperative pair.

[0216] For example, and as shown, the selector may be a selector 70g, whose magnet 71 is positioned to be close to (e.g. within a threshold distance from) sensor 100g when the selector is in safe mode (the mode shown in Fig. 11), and to be further away (e.g. beyond the threshold distance) from the sensor when the selector is in either of the firing modes. This may be particularly advantageous because operation of accessory 80 would not be interrupted by sensor 100g should the sensor or magnet 71 become dislodged or damaged in a manner that prevents the sensor from sensing the magnet.

[0217] In the example shown, sensor 100 is mounted on receiver 50 above selector 70g, and magnet 71 is positioned to be at the 12-o'clock position when the selector is in the safe mode (as shown), and thereby to be at the 9-o'clock position when the selector is in the semiautomatic firing mode, and at the 6-o'clock position when the selector is in the automatic firing mode. However, it is to be understood that distinguishing between the safe mode and the firing modes may be achieved by other cooperative positions including (i) othercooperative positions in which the magnet being within a threshold distance of the sensor indicates the safe mode, and (ii) cooperative positions in which the magnet being beyond the threshold distance of the sensor indicates the safe mode.

[0218] Figs. 12, 13, and 14 are schematic illustrations of selectors that include magnet 71, in accordance with some implementations. Fig. 12 provides a more detailed view of selector 70g, described with reference to Fig. 11. Fig. 13 shows a selector 70h, and Fig. 15 shows a selector 70i.

[0219] In each case, the selector comprises at least one selector lever 74 that comprises a lug 73 that defines a fulcrum 79, a magnet 71 that is mounted eccentrically with respect to the fulcrum, and a thumbswitch 75 extending from the lug. In each case, the lever / selector is configured to be installed on receiver 50 such that pivoting the thumbswitch around the fulcrum (i) rotates the lug about the fulcrum (and thereby about the selector axis, on which the fulcrum may lie) in a manner that selects between the safe mode, the first firing mode, and the second firing mode, and (ii) revolves the magnet around the fulcrum.

[0220] In the examples shown, magnet 71 is mounted on lug 73. However, it is to be understood that the magnet may be placed on other parts of the lever - e.g. on the thumbswitch.

[0221] The other selector levers described herein may similarly comprise a lug and a thumbswitch.

[0222] Selector 70g is a double-ended (e.g. ambidextrous) selector, having a block 72g, and a lever at each end of the block: a first lever 74g', and a second lever 74g". First lever 74g' comprises a lug 73g' and a thumbswitch 75g', and second lever 74" comprises a lug 73g" and a thumbswitch 75g".

[0223] The magnet 71 may be disposed a quarter-turn around fulcrum 79 and / or lug 73g' from the thumbswitch.

[0224] Although magnet 71 is shown on second lever 74" (e.g. lug 73" thereof), it is to be understood that a magnet 71 may alternatively or additionally be provided on first lever 74'.

[0225] Selector 70h is also a double-ended (e.g. ambidextrous) selector, having a block 72h, and a lever at each end of the block: a first lever 74h' (which may be a main or primary lever), and a second lever 74h" (which may be an ancillary lever or secondary lever). First lever 74h' may be bonded to, or integral with, block 72h. Second lever 74h" may beremovably fastenable to block 72h - e.g. via threading, such as a threaded bolt 77 that may screw into a threaded socket of the block. Bolt 77 may be bonded to or defined by lug 73h" - e.g. such that lever 74h" is screwable into block 72h. Alternatively, and as shown, lug 73h" may be shaped to define a ring through which bolt 77 is receivable to fasten the lug to block 72h.

[0226] In some implementations, lever 74h" may be provided as a replacement or add-on second lever for a selector. For example, lever 74h' and block 72h may be considered to represent components of an existing (e.g. original) selector of firearm 20, and Fig. 13 may be considered represent the augmentation of that existing selector with lever 74" - e.g. in order to make the selector compatible / cooperative with sensor 100g. Advantageously, in some implementations this replacement / addition may be performed without necessitating removal of the existing / original selector components - e.g. may be performed while block 72h remains disposed transversely through receiver 50 of the firearm.

[0227] In some implementations, a kit that includes sensor 100g and lever 74h" may be provided in order to upgrade an existing firearm with the RTF-sensing functionality described herein.

[0228] Selector 70i is a single-ended selector (e.g. for a right-handed individual), having a block 72i, and a lever 74i at one end of the block. Selector 70i may be as described hereinabove for selector 70, mutatis mutandis, except for its inclusion of magnet 71. Alternatively, selector 70i may be compatible with lever 74" - e.g. resulting in a selector that has a magnet on both levers, thereby facilitating a choice of which side of receiver 50 to place sensor 100g.

[0229] In some implementations, any of the sensors described herein, or a separate dedicated sensor, may comprise an inclinometer, and the system may be configured such that an RTF indication requires the inclinometer to detect that the a slope at which the firearm is currently held is within a predetermined threshold. This threshold may be, for example, within 40 degrees up and / or 40 degrees down from horizontal. In some implementations, the system may be configured such that this is also sufficient for an RTF indication. Alternatively, the system may be configured such that this is necessary but insufficient for an RTF indication. For example, the system may be configured such that accessory 80 is activated / operated / powered only upon both (a) the inclinometer detecting that the slope at which the firearm is currently held is within the predetermined threshold, and (b) (i) selector 70 being out of the safe mode, and / or (ii) firearm 20 being held in an active pose.

[0230] It is to be noted that systems whose sensor(s) is / are agnostic to the selector (e.g. systems that comprise sensor 300 and / or an inclinometer-based sensor in the absence of sensor 100 or sensor 200) may be used with firearms other than selective-fire firearms.

[0231] Example Implementations (some non-limiting examples of the concepts herein are recited below):

[0232] Example 1. Apparatus for use with an electrical accessory for a selective-fire firearm that has a receiver and a selector, the selector including (i) a block that defines a block axis and that extends transversely through the receiver, and (ii) a lever attached to the block and extending radially away from the block axis such that pivoting the lever about the block axis rotates the block around the block axis to select between a safe mode of the firearm, a first firing mode of the firearm, and a second firing mode of the firearm, the apparatus comprising a readiness-to-fire sensor that comprises: a case, configured to be installed on the receiver; an interface, configured to interface with the electrical accessory; and / or a probe, operatively coupled to the interface and mounted in a manner in which installation of the case on the receiver engages the probe with the block in a manner in which the probe moves responsively to rotation of the block such that, in the first firing mode and the second firing mode but not in the safe mode, the sensor activates the electrical accessory via the interface.

[0233] Example 2. The apparatus according to example 1, wherein the sensor comprises a spring that, while the case remains mounted on the receiver, presses the probe against the block.

[0234] Example 3. The apparatus according to example 1, wherein the sensor further comprises an override, manually actuatable to activate the electrical accessory via the interface.

[0235] Example 4. The apparatus according to example 1, wherein the firearm is an assault rifle.

[0236] Example 5. The apparatus according to example 1, wherein the receiver is a lower receiver, and the firearm further includes an upper receiver secured to the lower receiver.

[0237] Example 6. The apparatus according to example 1, wherein the probe is configured to engage the block via adhesion.

[0238] Example 7. The apparatus according to example 1, wherein the probe is configured to engage the block via mating geometry.

[0239] Example 8. The apparatus according to example 1, wherein the probe is configured to engage the block via threading.

[0240] Example 9. The apparatus according to example 1, wherein the probe is configured to engage the block via friction.

[0241] Example 10. The apparatus according to example 1, wherein the case is configured to be installed on an opposite side of receiver from the lever.

[0242] Example 11. The apparatus according to example 1, wherein the sensor is configured to activate the electrical accessory via the interface whenever the selector is not in the safe mode.

[0243] Example 12. The apparatus according to example 1, wherein the sensor further comprises an inclinometer, and is configured to activate the electrical accessory via the interface only upon both (i) the selector being in either the first firing mode or the second firing mode, and (ii) the inclinometer detecting that the a slope at which the firearm is currently held is within a predetermined threshold.

[0244] Example 13. The apparatus according to example 1, further comprising a jig, shaped complementarily with respect to the firearm and configured to guide positioning of the case for installation on the receiver.

[0245] Example 14. The apparatus according to example 13, wherein the jig is configured to reversibly snap -fit onto the firearm.

[0246] Example 15. The apparatus according to example 13, wherein the case is mounted on, and removable from, the jig.

[0247] Example 16. The apparatus according to example 1, wherein the apparatus comprises the electrical accessory.

[0248] Example 17. The apparatus according to example 16, wherein the electrical accessory is a flashlight.

[0249] Example 18. The apparatus according to example 16, wherein the electrical accessory is a laser sight.

[0250] Example 19. The apparatus according to example 16, wherein the electrical accessory is a scope.

[0251] Example 20. The apparatus according to example 16, wherein the electrical accessory is a component of an Identification Friend or Foe (IFF) system.

[0252] Example 21. The apparatus according to example 16, wherein the electrical accessory is a transmitter.

[0253] Example 22. The apparatus according to example 16, wherein the electrical accessory is a transponder.

[0254] Example 23. The apparatus according to example 16, wherein the electrical accessory is a transceiver.

[0255] Example 24. The apparatus according to example 16, wherein the electrical accessory is a gun-safety accessory.

[0256] Example 25. The apparatus according to example 1, wherein the interface is an electrical terminal, and the sensor is configured to activate the electrical accessory by powering the electrical accessory via the electrical terminal.

[0257] Example 26. The apparatus according to example 25, wherein the sensor is configured to be connected to a power source external to the sensor, and to power the electrical accessory via the electrical terminal by transferring power from the power source to the electrical accessory.

[0258] Example 27. The apparatus according to example 26, wherein the power source is mounted on the firearm, and wherein the sensor is configured to be connected to the power source that is mounted on the firearm.

[0259] Example 28. The apparatus according to example 26, wherein the power source is housed by the electrical accessory, and wherein the sensor is configured to serve as a power switch of the electrical accessory.

[0260] Example 29. The apparatus according to example 1, wherein the interface is a transmitter, and the sensor is configured to activate the electrical accessory by transmitting a signal to the electrical accessory.

[0261] Example 30. The apparatus according to example 29, wherein the signal is an electrical signal, and the transmitter is wiredly connectable to the electrical accessory, andconfigured to activate the electrical accessory by wiredly transmitting the electrical signal to the electrical accessory.

[0262] Example 31. The apparatus according to example 29, wherein the signal is a wireless signal, and the transmitter is configured to activate the electrical accessory by wirelessly transmitting the wireless signal to the electrical accessory.

[0263] Example 32. The apparatus according to example 1, wherein the case has a back, the probe is mounted to protrude through the back, and the case is configured to be mounted with the back facing the receiver such that the probe engages the block.

[0264] Example 33. The apparatus according to example 32, wherein the sensor comprises an adhesive on the back of the case, configured to secure the sensor to the receiver.

[0265] Example 34. The apparatus according to example 33, wherein the adhesive is a pressure-sensitive adhesive.

[0266] Example 35. The apparatus according to example 33, wherein the adhesive is a contact adhesive.

[0267] Example 36. The apparatus according to example 33, wherein the adhesive is an anaerobic adhesive.

[0268] Example 37. The apparatus according to example 33, wherein the adhesive is a multi-component adhesive.

[0269] Example 38. The apparatus according to example 33, wherein the adhesive is aUV-curing adhesive.

[0270] Example 39. The apparatus according to example 33, wherein the adhesive is a heat-curing adhesive.

[0271] Example 40. The apparatus according to example 33, wherein the adhesive is on a double-sided tape.

[0272] Example 41. The apparatus according to example 33, wherein the adhesive is a first adhesive, and the sensor comprises a second adhesive on the probe, the second adhesive being movable with respect to the first adhesive and configured to secure the probe to the block.

[0273] Example 42. The apparatus according to example 41, wherein the second adhesive has the same composition as the first adhesive.

[0274] Example 43. The apparatus according to example 41, wherein the second adhesive has a different composition from the first adhesive.

[0275] Example 44. The apparatus according to example 41, wherein the sensor comprises a backing sheet backing the first adhesive and the second adhesive, such that peeling off the backing sheet exposes both the first adhesive and the second adhesive.

[0276] Example 45. The apparatus according to example 1, wherein the probe is rotatably mounted such that the movement of the probe responsive to the rotation of the block around the block axis is rotation of the probe around a probe axis.

[0277] Example 46. The apparatus according to example 45, wherein the probe is rotatably mounted such that the probe axis is colinear with the block axis.

[0278] Example 47. The apparatus according to example 45, wherein the probe is rotatably mounted such that the probe axis is transverse to the block axis.

[0279] Example 48. The apparatus according to example 1, wherein the sensor comprises a switch that: is electrically connected to the interface, has an open state and a closed state, and / or is operatively coupled to the probe such that: in the first firing mode and the second firing mode the probe is positioned such that the switch is closed, the sensor thereby activating the electrical accessory via the interface, and / or responsively to the rotation of the block around the block axis upon the lever being pivoted to select the safe mode the probe moves to open the switch, the sensor thereby ceasing to activate the electrical accessory via the interface.

[0280] Example 49. The apparatus according to example 48, wherein the probe is mounted such that installation of the case on the receiver engages the probe with the block in a manner in which the probe rotates responsively to rotation of the block around the block axis, and / or the sensor further comprises a cam, coupled to the probe, and shaped to operate the switch responsively to rotation of the probe.

[0281] Example 50. The apparatus according to example 49, wherein the switch is a normally-open switch, and the cam is shaped to hold the switch closed in the first firing mode and the second firing mode.

[0282] Example 51. The apparatus according to example 49, wherein the switch is a normally-open switch, and the cam is shaped to hold the switch closed whenever the selector is not in the safe mode.

[0283] Example 52. Apparatus for use with an electrical accessory for a selective-fire firearm that has a receiver and a selector, the selector including (i) a block that defines a block axis and that extends transversely through the receiver, and (ii) a lever attached to the block and extending radially away from the block axis such that pivoting the lever about the block axis rotates the block around the block axis to select between a safe mode of the firearm, a first firing mode of the firearm, and a second firing mode of the firearm, the apparatus comprising a readiness-to-fire sensor that comprises: a case, configured to be installed on the receiver; a switch, having an open state and a closed state; a terminal, electrically connected to the switch and electrically connectable to the electrical accessory such that: in the closed state of the switch, electrical power can flow through the switch and the terminal to the electrical accessory, whereas in the open state of the switch, electrical power cannot flow through the switch and the terminal to the electrical accessory; and / or a probe, operatively coupled to the switch and mounted in a manner in which installation of the case on the receiver engages the probe with the block such that: in the first firing mode and the second firing mode, the probe is positioned such that the switch is closed, and / or responsively to rotation of the block around the block axis upon the lever being pivoted to select the safe mode, the probe moves to open the switch.

[0284] Example 53. The apparatus according to example 52, further comprising the electrical accessory.

[0285] Example 54. The apparatus according to example 53, wherein the electrical accessory is a flashlight.

[0286] Example 55. The apparatus according to example 53, wherein the electrical accessory is a laser sight.

[0287] Example 56. The apparatus according to example 53, wherein the electrical accessory is a component of an Identification Friend or Foe (IFF) system.

[0288] Example 57. The apparatus according to example 53, wherein the electrical accessory is a transmitter.

[0289] Example 58. The apparatus according to example 53, wherein the electrical accessory is a transponder.

[0290] Example 59. The apparatus according to example 53, wherein the electrical accessory is a transceiver.

[0291] Example 60. The apparatus according to example 53, wherein the electrical accessory is a gun safety accessory.

[0292] Example 61. The apparatus according to example 52, wherein the firearm is an assault rifle.

[0293] Example 62. The apparatus according to example 52, wherein the receiver is a lower receiver, and the firearm further includes an upper receiver secured to the lower receiver.

[0294] Example 63. Apparatus for use with an electrical accessory for a selective-fire firearm that has a receiver and a selector, the selector including (i) a block that defines a block axis and that extends transversely through the receiver, and (ii) a lever attached to the block and extending radially away from the block axis such that pivoting the lever about the block axis rotates the block around the block axis to select between a safe mode of the firearm, a first firing mode of the firearm, and a second firing mode of the firearm, the apparatus comprising a readiness-to-fire sensor that comprises: a case, configured to be installed on the receiver; a switch, having an open state and a closed state; an interface, connected to the switch and configured to interface with the electrical accessory such that, in the closed state but not in the open state, the sensor activates the electrical accessory; and / or a probe, operatively coupled to the switch and mounted in a manner in which installation of the case on the receiver engages the probe with the block such that: in the first firing mode and the second firing mode, the probe is positioned such that the switch is closed, and / or responsively to rotation of the block around the block axis upon the lever being pivoted to select the safe mode, the probe moves to open the switch.

[0295] Example 64. Apparatus for use with a selective-fire firearm that has a receiver and a selector, the selector including (i) a block that defines a block axis and that extends transversely through the receiver, and (ii) a lever attached to the block and extending radially away from the block axis such that pivoting the lever about the block axis rotates the block around the block axis to select between a safe mode of the firearm, a first firing mode of the firearm, and a second firing mode of the firearm, the apparatus comprising a readiness-to- fire sensor that comprises: a case, configured to be installed on the receiver; and / or a probe, mounted in the case in a manner in which installation of the case on the receiver engages the probe with the block in a manner in which the probe moves responsively to movement of the block such that: in the safe mode, the sensor is in a first state, and / or in the first firing mode and the second firing mode the sensor is in a second state.

[0296] Example 65. Apparatus for use with an electrical accessory for a selective-fire firearm that has a grip, a receiver, and a selector, the selector including (i) a block that defines a block axis and that extends transversely through the receiver, and (ii) a lever attached to the block and extending radially away from the block axis such that pivoting the lever about the block axis rotates the block around the block axis to select between a safe mode of the firearm, a first firing mode of the firearm, and a second firing mode of the firearm, the apparatus comprising a readiness-to-fire sensor that comprises: a case, configured to be installed in the grip; an interface, configured to interface with the electrical accessory; and / or a probe, operatively coupled to the interface and engageable with the block in a manner in which the probe moves responsively to rotation of the block such that, in the first firing mode and the second firing mode but not in the safe mode, the sensor activates the electrical accessory via the interface.

[0297] Example 66. Apparatus for use with an electrical accessory for a selective-fire firearm that has a grip, a receiver, and a selector that is operable to select between a safe mode of the firearm, a first firing mode of the firearm, and a second firing mode of the firearm, the apparatus comprising a readiness-to-fire sensor that comprises: a case, configured to be installed in the grip; an interface, configured to interface with the electrical accessory; and / ora probe, operatively coupled to the interface, and configured to move responsively to operation of the selector such that, in the first firing mode and the second firing mode but not in the safe mode, the sensor activates the electrical accessory via the interface.

[0298] Example 67. Apparatus for use with an electrical accessory for a firearm that has a stock that has a butt, the apparatus comprising a readiness-to-fire sensor that comprises: a case, configured to be installed on the butt in a shoulder-facing position; an interface, configured to interface with the electrical accessory; and / or a pressure switch, operatively coupled to the interface and mounted such that when the case is installed on the butt, pressure on the sensor closes the pressure switch such that the sensor activates the electrical accessory via the interface.

[0299] Example 68. A method for use with a selective-fire firearm that has a receiver and a selector, the selector including (i) a block that defines a block axis and that extends transversely through the receiver, and (ii) a lever attached to the block and extending radially away from the block axis such that pivoting the lever about the block axis rotates the block around the block axis to select between a safe mode of the firearm, a first firing mode of the firearm, and a second firing mode of the firearm, the method comprising: on the firearm, installing an electrical accessory for the firearm; and / or on the receiver, installing a case of a readiness-to-fire sensor such that: an interface of the receiver interfaces with the electrical accessory, and / or a probe of the sensor engages the block in a manner in which the probe moves responsively to movement of the block such that, in the first firing mode and the second firing mode but not in the safe mode, the sensor activates the electrical accessory via the interface.

[0300] Example 69. A method for use with an electrical accessory for a selective-fire firearm that has a receiver and a selector, the selector including (i) a block that defines a block axis and that extends transversely through the receiver, and (ii) a lever attached to the block and extending radially away from the block axis such that pivoting the lever about the block axis rotates the block around the block axis to select between a safe mode of the firearm, a first firing mode of the firearm, and a second firing mode of the firearm, the method comprising: connecting an interface of a readiness-to-fire sensor to the electrical accessory; and / orinstalling a case of the sensor on the receiver such that a probe of the sensor engages the block in a manner in which the probe moves responsively to movement of the block such that, in the first firing mode and the second firing mode but not in the safe mode, the sensor activates the electrical accessory via the interface.

[0301] Example 70. A method for use with an electrical accessory for a selective-fire firearm that has a receiver and a selector, the selector including (i) a block that defines a block axis and that extends transversely through the receiver, and (ii) a lever attached to the block and extending radially away from the block axis such that pivoting the lever about the block axis rotates the block around the block axis to select between a safe mode of the firearm, a first firing mode of the firearm, and a second firing mode of the firearm, the method comprising: verifying that the selector is in the safe mode; and / or while the selector remains in the safe mode, installing a case of a sensor on the receiver such that a probe of the sensor engages the block in a manner in which the probe moves responsively to movement of the block such that: in the safe mode, the sensor is in a first state, and / or in the first firing mode and the second firing mode the sensor is in a second state.

[0302] Example 71. Apparatus for use with an electrical accessory for a selective-fire firearm that has a receiver and a selector, the selector including (i) a block that defines a block axis and that extends transversely through the receiver, and (ii) a lever attached to the block and extending radially away from the block axis such that pivoting the lever about the block axis rotates the block around the block axis to select between a safe mode of the firearm, a first firing mode of the firearm, and a second firing mode of the firearm, the apparatus comprising a readiness-to-fire sensor that comprises: a case, configured to be installed on the receiver; an interface, configured to interface with the electrical accessory; and / or a probe, operatively coupled to the interface and mounted in a manner in which installation of the case on the receiver engages the probe with the selector in a manner in which the probe moves responsively to rotation of the block such that, in the first firing mode and the second firing mode but not in the safe mode, the sensor activates the electrical accessory via the interface.

[0303] Example 72. The apparatus according to example 71, wherein the lever is a first lever, and the selector includes a second lever opposite the first lever, and wherein the probe is mounted in a manner in which installation of the case on the receiver engages the probe with the second lever.

[0304] Example 73. The apparatus according to example 71, wherein the probe is mounted in a manner in which installation of the case on the receiver engages the probe with the block.

[0305] Example 74. Apparatus for use with an electrical accessory for a selective-fire firearm that has a receiver and a selector, the selector including (i) a block that defines a block axis and that extends transversely through the receiver, and (ii) a lever attached to the block and extending radially away from the block axis such that pivoting the lever about the block axis rotates the block around the block axis to select between a safe mode of the firearm, a first firing mode of the firearm, and a second firing mode of the firearm, the apparatus comprising a readiness-to-fire sensor that comprises: a case, configured to be installed on the receiver; a switch, having an open state and a closed state; a terminal, electrically connected to the switch and electrically connectable to the electrical accessory such that: in the closed state of the switch, electrical power can flow through the switch and the terminal to the electrical accessory, whereas in the open state of the switch, electrical power cannot flow through the switch and the terminal to the electrical accessory; and / or a probe, operatively coupled to the switch and mounted in a manner in which installation of the case on the receiver engages the probe with the selector such that: in the first firing mode and the second firing mode, the probe is positioned such that the switch is closed, and / or responsively to rotation of the block around the block axis upon the lever being pivoted to select the safe mode, the probe moves to open the switch.

[0306] Example 75. Apparatus for use with an electrical accessory for a selective-fire firearm that has a receiver and a selector, the selector including (i) a block that defines a block axis and that extends transversely through the receiver, and (ii) a lever attached to the block and extending radially away from the block axis such that pivoting the lever about the block axis rotates the block around the block axis to select between a safe mode of thefirearm, a first firing mode of the firearm, and a second firing mode of the firearm, the apparatus comprising a readiness-to-fire sensor that comprises: a case, configured to be installed on the receiver; a switch, having an open state and a closed state; an interface, connected to the switch and configured to interface with the electrical accessory such that, in the closed state but not in the open state, the sensor activates the electrical accessory; and / or a probe, operatively coupled to the switch and mounted in a manner in which installation of the case on the receiver engages the probe with the selector such that: in the first firing mode and the second firing mode, the probe is positioned such that the switch is closed, and / or responsively to rotation of the block around the block axis upon the lever being pivoted to select the safe mode, the probe moves to open the switch.

[0307] Example 76. Apparatus for use with a selective-fire firearm that has a receiver and a selector, the selector including (i) a block that defines a block axis and that extends transversely through the receiver, and (ii) a lever attached to the block and extending radially away from the block axis such that pivoting the lever about the block axis rotates the block around the block axis to select between a safe mode of the firearm, a first firing mode of the firearm, and a second firing mode of the firearm, the apparatus comprising a readiness-to- fire sensor that comprises: a case, configured to be installed on the receiver; and / or a probe, mounted in the case in a manner in which installation of the case on the receiver engages the probe with the selector in a manner in which the probe moves responsively to movement of the block such that: in the safe mode, the sensor is in a first state, and / or in the first firing mode and the second firing mode the sensor is in a second state.

[0308] Example 77. Apparatus for use with an electrical accessory for a selective-fire firearm that has a grip, a receiver, and a selector, the selector including (i) a block that defines a block axis and that extends transversely through the receiver, and (ii) a lever attached to the block and extending radially away from the block axis such that pivoting the lever about the block axis rotates the block around the block axis to select between a safe mode of thefirearm, a first firing mode of the firearm, and a second firing mode of the firearm, the apparatus comprising a readiness-to-fire sensor that comprises: a case, configured to be installed in the grip; an interface, configured to interface with the electrical accessory; and / or a probe, operatively coupled to the interface and engageable with the selector in a manner in which the probe moves responsively to rotation of the selector such that, in the first firing mode and the second firing mode but not in the safe mode, the sensor activates the electrical accessory via the interface.

[0309] Example 78. Apparatus for use with an electrical accessory for a selective-fire firearm that has a grip, a receiver, and a selector that is operable to select between a safe mode of the firearm, a first firing mode of the firearm, and a second firing mode of the firearm, the apparatus comprising a readiness-to-fire sensor that comprises: a case, configured to be installed in the grip; an interface, configured to interface with the electrical accessory; and / or a probe, operatively coupled to the interface, and configured to move responsively to operation of the selector such that, in the first firing mode and the second firing mode but not in the safe mode, the sensor activates the electrical accessory via the interface.

[0310] Example 79. Apparatus for use with an electrical accessory for a firearm that has a stock that has a butt, the apparatus comprising a readiness-to-fire sensor that comprises: a case, configured to be installed on the butt in a shoulder-facing position; an interface, configured to interface with the electrical accessory; and / or a pressure switch, operatively coupled to the interface and mounted such that when the case is installed on the butt, pressure on the sensor closes the pressure switch such that the sensor activates the electrical accessory via the interface.

[0311] Example 80. A method for use with a selective-fire firearm that has a receiver and a selector, the selector including (i) a block that defines a block axis and that extends transversely through the receiver, and (ii) a lever attached to the block and extending radially away from the block axis such that pivoting the lever about the block axis rotates the block around the block axis to select between a safe mode of the firearm, a first firing mode of the firearm, and a second firing mode of the firearm, the method comprising: on the firearm, installing an electrical accessory for the firearm; and / or on the receiver, installing a case of a readiness-to-fire sensor such that: an interface of the receiver interfaces with the electrical accessory, and / ora probe of the sensor engages the selector in a manner in which the probe moves responsively to movement of the selector such that, in the first firing mode and the second firing mode but not in the safe mode, the sensor activates the electrical accessory via the interface.

[0312] Example 81. A method for use with an electrical accessory for a selective-fire firearm that has a receiver and a selector, the selector including (i) a block that defines a block axis and that extends transversely through the receiver, and (ii) a lever attached to the block and extending radially away from the block axis such that pivoting the lever about the block axis rotates the block around the block axis to select between a safe mode of the firearm, a first firing mode of the firearm, and a second firing mode of the firearm, the method comprising: connecting an interface of a readiness-to-fire sensor to the electrical accessory; and / or installing a case of the sensor on the receiver such that a probe of the sensor engages the selector in a manner in which the probe moves responsively to movement of the selector such that, in the first firing mode and the second firing mode but not in the safe mode, the sensor activates the electrical accessory via the interface.

[0313] Example 82. A method for use with an electrical accessory for a selective-fire firearm that has a receiver and a selector, the selector including (i) a block that defines a block axis and that extends transversely through the receiver, and (ii) a lever attached to the block and extending radially away from the block axis such that pivoting the lever about the block axis rotates the block around the block axis to select between a safe mode of the firearm, a first firing mode of the firearm, and a second firing mode of the firearm, the method comprising: verifying that the selector is in the safe mode; and / or while the selector remains in the safe mode, installing a case of a sensor on the receiver such that a probe of the sensor engages the selector in a manner in which the probe moves responsively to movement of the block such that: in the safe mode, the sensor is in a first state, and / or in the first firing mode and the second firing mode the sensor is in a second state.

[0314] Example 83. The apparatus or method according to any one of examples 74-82, wherein the lever is a first lever, and the selector includes a second lever opposite the first lever, and wherein the probe is mounted to engage the second lever.

[0315] Example 84. The apparatus or method according to any one of examples 74-82, wherein the probe is mounted to engage the block.

[0316] Example 85. Apparatus for use with an electrical accessory for a selective-fire firearm that has a receiver and a selector, the selector including (i) a block that defines a block axis and that extends transversely through the receiver, and (ii) a lever attached to the block and extending radially away from the block axis such that pivoting the lever about the block axis rotates the block around the block axis to select between a safe mode of the firearm, a first firing mode of the firearm, and a second firing mode of the firearm, the apparatus comprising a readiness-to-fire sensor that comprises: a case; an interface, configured to interface with the electrical accessory; and / or a probe, operatively coupled to the interface, wherein the sensor is configured to be installed on the receiver in a manner that places the probe in communication with the selector such that, in the first firing mode and the second firing mode but not in the safe mode, the sensor activates the electrical accessory via the interface.

[0317] Example 86. The apparatus according to example 85, wherein the probe is a mechanical probe, configured to be placed in mechanical communication with the selector, and wherein the sensor is configured to be installed on the receiver in a manner that mechanically engages the probe with the selector.

[0318] Example 87. The apparatus according to example 86, wherein the lever is a first lever, and the selector includes a second lever opposite the first lever, and wherein the sensor is configured to be installed on the receiver in a manner that mechanically engages the probe with the second lever.

[0319] Example 88. The apparatus according to example 87, wherein the probe defines a groove dimensioned to receive the second lever upon installation of the sensor on the receiver.

[0320] Example 89. The apparatus according to example 86, wherein the probe is configured to mechanically engage the block, and wherein the sensor is configured to be installed on the receiver in a manner that mechanically engages the probe with the block.

[0321] Example 90. The apparatus according to example 85, wherein the probe is a magnetic probe, configured to be placed in magnetic communication with the selector, and wherein the sensor is configured to be installed on the receiver in a manner that places the probe in magnetic communication with the selector.

[0322] Example 91. Apparatus for use with a selective-fire firearm that has a receiver, a safe mode, a first firing mode, and a second firing mode, the apparatus comprising a selector lever that comprises: a lug that defines a fulcrum; a magnet, mounted eccentrically with respect to the fulcrum; and / or a thumbswitch extending from the lug, the lever configured to be installed on the receiver such that pivoting the thumbswitch around the fulcrum (i) rotates the lug about the fulcrum in a manner that selects between the safe mode, the first firing mode, and the second firing mode, and (ii) revolves the magnet around the fulcrum.

[0323] Example 92. The apparatus according to example 91, wherein: the apparatus comprises a selector, the lever being a lever of the selector, the selector further includes a block that defines a block axis, the lug is fastened to an end of the block such that the fulcrum lies on the block axis, and the thumbswitch extends radially away from the block axis such that pivoting the thumbswitch around the block axis (i) rotates the block about the block axis, and (ii) revolves the magnet around the block axis, and / or the block is configured to be disposed transversely through the receiver such that rotation of the block about the block axis selects between the safe mode, the first firing mode, and the second firing mode.

[0324] Example 93. The apparatus according to any one of examples 91-92, wherein the magnet is mounted on the lug.

[0325] Example 94. The apparatus according to any one of examples 91-92, wherein the magnet is mounted on the thumbswitch.

[0326] Example 95. The apparatus according to any one of examples 91-94, wherein:the lever is for use as a second lever of a selector of the firearm, the selector including(i) a block that defines a block axis and that extends transversely through the receiver, and(ii) a first lever attached to the block and extending radially away from the block axis such that pivoting the first lever about the block axis rotates the block around the block axis to select between the safe mode, the first firing mode, and the second firing mode, and / or the lug is configured to be fastened to an opposite end of the block from the first lever such that the fulcrum lies on the block axis, the thumbswitch extends radially away from the block axis, and pivoting the thumbswitch around the fulcrum (i) rotates the block around the block axis to select between the safe mode, the first firing mode, and the second firing mode, and (ii) revolves the magnet around the block axis.

[0327] Example 96. The apparatus according to example 95, wherein the lever is a replacement second lever for the selector, for replacing an original second lever of the selector.

[0328] Example 97. The apparatus according to example 95, wherein the lug defines a threaded bolt via which the lug is fastenable to the opposite end of the block.

[0329] Example 98. The apparatus according to example 95, wherein the lug defines a ring through which a threaded bolt is receivable to fasten the lug to the opposite end of the block.

[0330] Example 99. A system for use with an electrical accessory for the firearm, the system comprising: the apparatus of any one of examples 85-98, and / or a readiness-to-fire sensor: comprising: a case; an interface, configured to interface with the electrical accessory; and / or a probe, configured to be installed on the receiver in a manner in which: the probe is positioned to distinguish between positions of the magnet, and / or the interface is in communication with the selector such that, in the first firing mode and the second firing mode but not in the safe mode, the sensor activates the electrical accessory via the interface.

[0331] Example 100. The system according to example 99, wherein the probe comprises a magnetic switch.

[0332] Example 101. The system according to any one of examples 99-100, further comprising the electrical accessory.

[0333] The present invention is not limited to the examples that have been particularly shown and described hereinabove. Rather, the scope of the present invention includes both combinations and subcombinations of the various features described hereinabove, as well as variations and modifications thereof that are not in the prior art, which would occur to persons skilled in the art upon reading the foregoing description.

Claims

CLAIMS1. Apparatus for use with an electrical accessory for a selective-fire firearm that has a receiver and a selector, the selector including (i) a block that defines a block axis and that extends transversely through the receiver, and (ii) a lever attached to the block and extending radially away from the block axis such that pivoting the lever about the block axis rotates the block around the block axis to select between a safe mode of the firearm, a first firing mode of the firearm, and a second firing mode of the firearm, the apparatus comprising a readiness-to-fire sensor that comprises: a case, configured to be installed on the receiver; an interface, configured to interface with the electrical accessory; and a probe, operatively coupled to the interface and mounted in a manner in which installation of the case on the receiver engages the probe with the block in a manner in which the probe moves responsively to rotation of the block such that, in the first firing mode and the second firing mode but not in the safe mode, the sensor activates the electrical accessory via the interface.

2. The apparatus according to claim 1, wherein the sensor comprises a spring that, while the case remains mounted on the receiver, presses the probe against the block.

3. The apparatus according to any one of claims 1-2, wherein the sensor further comprises an override, manually actuatable to activate the electrical accessory via the interface.

4. The apparatus according to any one of claims 1-3, wherein the firearm is an assault rifle.

5. The apparatus according to any one of claims 1-4, wherein the receiver is a lower receiver, and the firearm further includes an upper receiver secured to the lower receiver.

6. The apparatus according to any one of claims 1-5, wherein the probe is configured to engage the block via adhesion.

7. The apparatus according to any one of claims 1-5, wherein the probe is configured to engage the block via mating geometry.

8. The apparatus according to any one of claims 1-5, wherein the probe is configured to engage the block via threading.

9. The apparatus according to any one of claims 1-5, wherein the probe is configured to engage the block via friction.

10. The apparatus according to any one of claims 1-9, wherein the case is configured to be installed on an opposite side of receiver from the lever.

11. The apparatus according to any one of claims 1-10, wherein the sensor is configured to activate the electrical accessory via the interface whenever the selector is not in the safe mode.

12. The apparatus according to any one of claims 1-11, wherein the sensor further comprises an inclinometer, and is configured to activate the electrical accessory via the interface only upon both (i) the selector being in either the first firing mode or the second firing mode, and (ii) the inclinometer detecting that the a slope at which the firearm is currently held is within a predetermined threshold.

13. The apparatus according to any one of claims 1-12, further comprising a jig, shaped complementarily with respect to the firearm and configured to guide positioning of the case for installation on the receiver.

14. The apparatus according to claim 13, wherein the jig is configured to reversibly snap- fit onto the firearm.

15. The apparatus according to claim 13, wherein the case is mounted on, and removable from, the jig.

16. The apparatus according to any one of claims 1-15, wherein the apparatus comprises the electrical accessory.

17. The apparatus according to claim 16, wherein the electrical accessory is a flashlight.

18. The apparatus according to claim 16, wherein the electrical accessory is a laser sight.

19. The apparatus according to claim 16, wherein the electrical accessory is a scope.

20. The apparatus according to claim 16, wherein the electrical accessory is a component of an Identification Friend or Foe (IFF) system.

21. The apparatus according to claim 16, wherein the electrical accessory is a transmitter.

22. The apparatus according to claim 16, wherein the electrical accessory is a transponder.

23. The apparatus according to claim 16, wherein the electrical accessory is a transceiver.

24. The apparatus according to claim 16, wherein the electrical accessory is a gun-safety accessory.

25. The apparatus according to any one of claims 1-24, wherein the interface is an electrical terminal, and the sensor is configured to activate the electrical accessory by powering the electrical accessory via the electrical terminal.

26. The apparatus according to claim 25, wherein the sensor is configured to be connected to a power source external to the sensor, and to power the electrical accessory via the electrical terminal by transferring power from the power source to the electrical accessory.

27. The apparatus according to claim 26, wherein the power source is mounted on the firearm, and wherein the sensor is configured to be connected to the power source that is mounted on the firearm.

28. The apparatus according to claim 26, wherein the power source is housed by the electrical accessory, and wherein the sensor is configured to serve as a power switch of the electrical accessory.

29. The apparatus according to any one of claims 1-28, wherein the interface is a transmitter, and the sensor is configured to activate the electrical accessory by transmitting a signal to the electrical accessory.

30. The apparatus according to claim 29, wherein the signal is an electrical signal, and the transmitter is wiredly connectable to the electrical accessory, and configured to activate the electrical accessory by wiredly transmitting the electrical signal to the electrical accessory.

31. The apparatus according to claim 29, wherein the signal is a wireless signal, and the transmitter is configured to activate the electrical accessory by wirelessly transmitting the wireless signal to the electrical accessory.

32. The apparatus according to any one of claims 1-31, wherein the case has a back, the probe is mounted to protrude through the back, and the case is configured to be mounted with the back facing the receiver such that the probe engages the block.

33. The apparatus according to claim 32, wherein the sensor comprises an adhesive on the back of the case, configured to secure the sensor to the receiver.

34. The apparatus according to claim 33, wherein the adhesive is a pressure-sensitive adhesive.

35. The apparatus according to claim 33, wherein the adhesive is a contact adhesive.

36. The apparatus according to claim 33, wherein the adhesive is an anaerobic adhesive.

37. The apparatus according to claim 33, wherein the adhesive is a multi-component adhesive.

38. The apparatus according to claim 33, wherein the adhesive is a UV-curing adhesive.

39. The apparatus according to claim 33, wherein the adhesive is a heat-curing adhesive.

40. The apparatus according to claim 33, wherein the adhesive is on a double-sided tape.

41. The apparatus according to claim 33, wherein the adhesive is a first adhesive, and the sensor comprises a second adhesive on the probe, the second adhesive being movable with respect to the first adhesive and configured to secure the probe to the block.

42. The apparatus according to claim 41, wherein the second adhesive has the same composition as the first adhesive.

43. The apparatus according to claim 41, wherein the second adhesive has a different composition from the first adhesive.

44. The apparatus according to claim 41, wherein the sensor comprises a backing sheet backing the first adhesive and the second adhesive, such that peeling off the backing sheet exposes both the first adhesive and the second adhesive.

45. The apparatus according to any one of claims 1-44, wherein the probe is rotatably mounted such that the movement of the probe responsive to the rotation of the block around the block axis is rotation of the probe around a probe axis.

46. The apparatus according to claim 45, wherein the probe is rotatably mounted such that the probe axis is colinear with the block axis.

47. The apparatus according to claim 45, wherein the probe is rotatably mounted such that the probe axis is transverse to the block axis.

48. The apparatus according to any one of claims 1-47, wherein the sensor comprises a switch that: is electrically connected to the interface, has an open state and a closed state, andis operatively coupled to the probe such that: in the first firing mode and the second firing mode the probe is positioned such that the switch is closed, the sensor thereby activating the electrical accessory via the interface, and responsively to the rotation of the block around the block axis upon the lever being pivoted to select the safe mode the probe moves to open the switch, the sensor thereby ceasing to activate the electrical accessory via the interface.

49. The apparatus according to claim 48, wherein: the probe is mounted such that installation of the case on the receiver engages the probe with the block in a manner in which the probe rotates responsively to rotation of the block around the block axis, and the sensor further comprises a cam, coupled to the probe, and shaped to operate the switch responsively to rotation of the probe.

50. The apparatus according to claim 49, wherein the switch is a normally-open switch, and the cam is shaped to hold the switch closed in the first firing mode and the second firing mode.

51. The apparatus according to claim 49, wherein the switch is a normally-open switch, and the cam is shaped to hold the switch closed whenever the selector is not in the safe mode.

52. Apparatus for use with an electrical accessory for a selective-fire firearm that has a receiver and a selector, the selector including (i) a block that defines a block axis and that extends transversely through the receiver, and (ii) a lever attached to the block and extending radially away from the block axis such that pivoting the lever about the block axis rotates the block around the block axis to select between a safe mode of the firearm, a first firing mode of the firearm, and a second firing mode of the firearm, the apparatus comprising a readiness-to-fire sensor that comprises: a case, configured to be installed on the receiver; a switch, having an open state and a closed state; a terminal, electrically connected to the switch and electrically connectable to the electrical accessory such that: in the closed state of the switch, electrical power can flow through the switch and the terminal to the electrical accessory, whereasin the open state of the switch, electrical power cannot flow through the switch and the terminal to the electrical accessory; and a probe, operatively coupled to the switch and mounted in a manner in which installation of the case on the receiver engages the probe with the block such that: in the first firing mode and the second firing mode, the probe is positioned such that the switch is closed, and responsively to rotation of the block around the block axis upon the lever being pivoted to select the safe mode, the probe moves to open the switch.

53. The apparatus according to claim 52, further comprising the electrical accessory.

54. The apparatus according to claim 53, wherein the electrical accessory is a flashlight.

55. The apparatus according to claim 53, wherein the electrical accessory is a laser sight.

56. The apparatus according to claim 53, wherein the electrical accessory is a component of an Identification Friend or Foe (IFF) system.

57. The apparatus according to claim 53, wherein the electrical accessory is a transmitter.

58. The apparatus according to claim 53, wherein the electrical accessory is a transponder.

59. The apparatus according to claim 53, wherein the electrical accessory is a transceiver.

60. The apparatus according to claim 53, wherein the electrical accessory is a gun safety accessory.

61. The apparatus according to any one of claims 52-60, wherein the firearm is an assault rifle.

62. The apparatus according to any one of claims 52-61, wherein the receiver is a lower receiver, and the firearm further includes an upper receiver secured to the lower receiver.

63. Apparatus for use with an electrical accessory for a selective-fire firearm that has a receiver and a selector, the selector including (i) a block that defines a block axis and that extends transversely through the receiver, and (ii) a lever attached to the block and extending radially away from the block axis such that pivoting the lever about the block axis rotates the block around the block axis to select between a safe mode of the firearm, a first firing mode of the firearm, and a second firing mode of the firearm, the apparatus comprising a readiness-to-fire sensor that comprises:a case, configured to be installed on the receiver; a switch, having an open state and a closed state; an interface, connected to the switch and configured to interface with the electrical accessory such that, in the closed state but not in the open state, the sensor activates the electrical accessory; and a probe, operatively coupled to the switch and mounted in a manner in which installation of the case on the receiver engages the probe with the block such that: in the first firing mode and the second firing mode, the probe is positioned such that the switch is closed, and responsively to rotation of the block around the block axis upon the lever being pivoted to select the safe mode, the probe moves to open the switch.

64. Apparatus for use with a selective-fire firearm that has a receiver and a selector, the selector including (i) a block that defines a block axis and that extends transversely through the receiver, and (ii) a lever attached to the block and extending radially away from the block axis such that pivoting the lever about the block axis rotates the block around the block axis to select between a safe mode of the firearm, a first firing mode of the firearm, and a second firing mode of the firearm, the apparatus comprising a readiness-to-fire sensor that comprises: a case, configured to be installed on the receiver; and a probe, mounted in the case in a manner in which installation of the case on the receiver engages the probe with the block in a manner in which the probe moves responsively to movement of the block such that: in the safe mode, the sensor is in a first state, and in the first firing mode and the second firing mode the sensor is in a second state.

65. Apparatus for use with an electrical accessory for a selective-fire firearm that has a grip, a receiver, and a selector, the selector including (i) a block that defines a block axis and that extends transversely through the receiver, and (ii) a lever attached to the block and extending radially away from the block axis such that pivoting the lever about the block axis rotates the block around the block axis to select between a safe mode of the firearm, a first firing mode of the firearm, and a second firing mode of the firearm, the apparatus comprising a readiness-to-fire sensor that comprises: a case, configured to be installed in the grip;an interface, configured to interface with the electrical accessory; and a probe, operatively coupled to the interface and engageable with the block in a manner in which the probe moves responsively to rotation of the block such that, in the first firing mode and the second firing mode but not in the safe mode, the sensor activates the electrical accessory via the interface.

66. Apparatus for use with an electrical accessory for a selective-fire firearm that has a grip, a receiver, and a selector that is operable to select between a safe mode of the firearm, a first firing mode of the firearm, and a second firing mode of the firearm, the apparatus comprising a readiness-to-fire sensor that comprises: a case, configured to be installed in the grip; an interface, configured to interface with the electrical accessory; and a probe, operatively coupled to the interface, and configured to move responsively to operation of the selector such that, in the first firing mode and the second firing mode but not in the safe mode, the sensor activates the electrical accessory via the interface.

67. Apparatus for use with an electrical accessory for a firearm that has a stock that has a butt, the apparatus comprising a readiness-to-fire sensor that comprises: a case, configured to be installed on the butt in a shoulder-facing position; an interface, configured to interface with the electrical accessory; and a pressure switch, operatively coupled to the interface and mounted such that when the case is installed on the butt, pressure on the sensor closes the pressure switch such that the sensor activates the electrical accessory via the interface.

68. A method for use with a selective-fire firearm that has a receiver and a selector, the selector including (i) a block that defines a block axis and that extends transversely through the receiver, and (ii) a lever attached to the block and extending radially away from the block axis such that pivoting the lever about the block axis rotates the block around the block axis to select between a safe mode of the firearm, a first firing mode of the firearm, and a second firing mode of the firearm, the method comprising: on the firearm, installing an electrical accessory for the firearm; and on the receiver, installing a case of a readiness-to-fire sensor such that: an interface of the receiver interfaces with the electrical accessory, anda probe of the sensor engages the block in a manner in which the probe moves responsively to movement of the block such that, in the first firing mode and the second firing mode but not in the safe mode, the sensor activates the electrical accessory via the interface.

69. A method for use with an electrical accessory for a selective-fire firearm that has a receiver and a selector, the selector including (i) a block that defines a block axis and that extends transversely through the receiver, and (ii) a lever attached to the block and extending radially away from the block axis such that pivoting the lever about the block axis rotates the block around the block axis to select between a safe mode of the firearm, a first firing mode of the firearm, and a second firing mode of the firearm, the method comprising: connecting an interface of a readiness-to-fire sensor to the electrical accessory; and installing a case of the sensor on the receiver such that a probe of the sensor engages the block in a manner in which the probe moves responsively to movement of the block such that, in the first firing mode and the second firing mode but not in the safe mode, the sensor activates the electrical accessory via the interface.

70. A method for use with an electrical accessory for a selective-fire firearm that has a receiver and a selector, the selector including (i) a block that defines a block axis and that extends transversely through the receiver, and (ii) a lever attached to the block and extending radially away from the block axis such that pivoting the lever about the block axis rotates the block around the block axis to select between a safe mode of the firearm, a first firing mode of the firearm, and a second firing mode of the firearm, the method comprising: verifying that the selector is in the safe mode; and while the selector remains in the safe mode, installing a case of a sensor on the receiver such that a probe of the sensor engages the block in a manner in which the probe moves responsively to movement of the block such that: in the safe mode, the sensor is in a first state, and in the first firing mode and the second firing mode the sensor is in a second state.

71. Apparatus for use with an electrical accessory for a selective-fire firearm that has a receiver and a selector, the selector including (i) a block that defines a block axis and that extends transversely through the receiver, and (ii) a lever attached to the block and extendingradially away from the block axis such that pivoting the lever about the block axis rotates the block around the block axis to select between a safe mode of the firearm, a first firing mode of the firearm, and a second firing mode of the firearm, the apparatus comprising a readiness-to-fire sensor that comprises: a case, configured to be installed on the receiver; an interface, configured to interface with the electrical accessory; and a probe, operatively coupled to the interface and mounted in a manner in which installation of the case on the receiver engages the probe with the selector in a manner in which the probe moves responsively to rotation of the block such that, in the first firing mode and the second firing mode but not in the safe mode, the sensor activates the electrical accessory via the interface.

72. The apparatus according to claim 71, wherein the lever is a first lever, and the selector includes a second lever opposite the first lever, and wherein the probe is mounted in a manner in which installation of the case on the receiver engages the probe with the second lever.

73. The apparatus according to claim 71, wherein the probe is mounted in a manner in which installation of the case on the receiver engages the probe with the block.

74. Apparatus for use with an electrical accessory for a selective-fire firearm that has a receiver and a selector, the selector including (i) a block that defines a block axis and that extends transversely through the receiver, and (ii) a lever attached to the block and extending radially away from the block axis such that pivoting the lever about the block axis rotates the block around the block axis to select between a safe mode of the firearm, a first firing mode of the firearm, and a second firing mode of the firearm, the apparatus comprising a readiness-to-fire sensor that comprises: a case, configured to be installed on the receiver; a switch, having an open state and a closed state; a terminal, electrically connected to the switch and electrically connectable to the electrical accessory such that: in the closed state of the switch, electrical power can flow through the switch and the terminal to the electrical accessory, whereas in the open state of the switch, electrical power cannot flow through the switch and the terminal to the electrical accessory; anda probe, operatively coupled to the switch and mounted in a manner in which installation of the case on the receiver engages the probe with the selector such that: in the first firing mode and the second firing mode, the probe is positioned such that the switch is closed, and responsively to rotation of the block around the block axis upon the lever being pivoted to select the safe mode, the probe moves to open the switch.

75. Apparatus for use with an electrical accessory for a selective-fire firearm that has a receiver and a selector, the selector including (i) a block that defines a block axis and that extends transversely through the receiver, and (ii) a lever attached to the block and extending radially away from the block axis such that pivoting the lever about the block axis rotates the block around the block axis to select between a safe mode of the firearm, a first firing mode of the firearm, and a second firing mode of the firearm, the apparatus comprising a readiness-to-fire sensor that comprises: a case, configured to be installed on the receiver; a switch, having an open state and a closed state; an interface, connected to the switch and configured to interface with the electrical accessory such that, in the closed state but not in the open state, the sensor activates the electrical accessory; and a probe, operatively coupled to the switch and mounted in a manner in which installation of the case on the receiver engages the probe with the selector such that: in the first firing mode and the second firing mode, the probe is positioned such that the switch is closed, and responsively to rotation of the block around the block axis upon the lever being pivoted to select the safe mode, the probe moves to open the switch.

76. Apparatus for use with a selective-fire firearm that has a receiver and a selector, the selector including (i) a block that defines a block axis and that extends transversely through the receiver, and (ii) a lever attached to the block and extending radially away from the block axis such that pivoting the lever about the block axis rotates the block around the block axis to select between a safe mode of the firearm, a first firing mode of the firearm, and a second firing mode of the firearm, the apparatus comprising a readiness-to-fire sensor that comprises: a case, configured to be installed on the receiver; anda probe, mounted in the case in a manner in which installation of the case on the receiver engages the probe with the selector in a manner in which the probe moves responsively to movement of the block such that: in the safe mode, the sensor is in a first state, and in the first firing mode and the second firing mode the sensor is in a second state.

77. Apparatus for use with an electrical accessory for a selective-fire firearm that has a grip, a receiver, and a selector, the selector including (i) a block that defines a block axis and that extends transversely through the receiver, and (ii) a lever attached to the block and extending radially away from the block axis such that pivoting the lever about the block axis rotates the block around the block axis to select between a safe mode of the firearm, a first firing mode of the firearm, and a second firing mode of the firearm, the apparatus comprising a readiness-to-fire sensor that comprises: a case, configured to be installed in the grip; an interface, configured to interface with the electrical accessory; and a probe, operatively coupled to the interface and engageable with the selector in a manner in which the probe moves responsively to rotation of the selector such that, in the first firing mode and the second firing mode but not in the safe mode, the sensor activates the electrical accessory via the interface.

78. Apparatus for use with an electrical accessory for a selective-fire firearm that has a grip, a receiver, and a selector that is operable to select between a safe mode of the firearm, a first firing mode of the firearm, and a second firing mode of the firearm, the apparatus comprising a readiness-to-fire sensor that comprises: a case, configured to be installed in the grip; an interface, configured to interface with the electrical accessory; and a probe, operatively coupled to the interface, and configured to move responsively to operation of the selector such that, in the first firing mode and the second firing mode but not in the safe mode, the sensor activates the electrical accessory via the interface.

79. Apparatus for use with an electrical accessory for a firearm that has a stock that has a butt, the apparatus comprising a readiness-to-fire sensor that comprises: a case, configured to be installed on the butt in a shoulder-facing position; an interface, configured to interface with the electrical accessory; anda pressure switch, operatively coupled to the interface and mounted such that when the case is installed on the butt, pressure on the sensor closes the pressure switch such that the sensor activates the electrical accessory via the interface.

80. A method for use with a selective-fire firearm that has a receiver and a selector, the selector including (i) a block that defines a block axis and that extends transversely through the receiver, and (ii) a lever attached to the block and extending radially away from the block axis such that pivoting the lever about the block axis rotates the block around the block axis to select between a safe mode of the firearm, a first firing mode of the firearm, and a second firing mode of the firearm, the method comprising: on the firearm, installing an electrical accessory for the firearm; and on the receiver, installing a case of a readiness-to-fire sensor such that: an interface of the receiver interfaces with the electrical accessory, and a probe of the sensor engages the selector in a manner in which the probe moves responsively to movement of the selector such that, in the first firing mode and the second firing mode but not in the safe mode, the sensor activates the electrical accessory via the interface.

81. A method for use with an electrical accessory for a selective-fire firearm that has a receiver and a selector, the selector including (i) a block that defines a block axis and that extends transversely through the receiver, and (ii) a lever attached to the block and extending radially away from the block axis such that pivoting the lever about the block axis rotates the block around the block axis to select between a safe mode of the firearm, a first firing mode of the firearm, and a second firing mode of the firearm, the method comprising: connecting an interface of a readiness-to-fire sensor to the electrical accessory; and installing a case of the sensor on the receiver such that a probe of the sensor engages the selector in a manner in which the probe moves responsively to movement of the selector such that, in the first firing mode and the second firing mode but not in the safe mode, the sensor activates the electrical accessory via the interface.

82. A method for use with an electrical accessory for a selective-fire firearm that has a receiver and a selector, the selector including (i) a block that defines a block axis and that extends transversely through the receiver, and (ii) a lever attached to the block and extending radially away from the block axis such that pivoting the lever about the block axis rotatesthe block around the block axis to select between a safe mode of the firearm, a first firing mode of the firearm, and a second firing mode of the firearm, the method comprising: verifying that the selector is in the safe mode; and while the selector remains in the safe mode, installing a case of a sensor on the receiver such that a probe of the sensor engages the selector in a manner in which the probe moves responsively to movement of the block such that: in the safe mode, the sensor is in a first state, and in the first firing mode and the second firing mode the sensor is in a second state.

83. The apparatus or method according to any one of claims 74-82, wherein the lever is a first lever, and the selector includes a second lever opposite the first lever, and wherein the probe is mounted to engage the second lever.

84. The apparatus or method according to any one of claims 74-82, wherein the probe is mounted to engage the block.

85. Apparatus for use with an electrical accessory for a selective-fire firearm that has a receiver and a selector, the selector including (i) a block that defines a block axis and that extends transversely through the receiver, and (ii) a lever attached to the block and extending radially away from the block axis such that pivoting the lever about the block axis rotates the block around the block axis to select between a safe mode of the firearm, a first firing mode of the firearm, and a second firing mode of the firearm, the apparatus comprising a readiness-to-fire sensor that comprises: a case; an interface, configured to interface with the electrical accessory; and a probe, operatively coupled to the interface, wherein the sensor is configured to be installed on the receiver in a manner that places the probe in communication with the selector such that, in the first firing mode and the second firing mode but not in the safe mode, the sensor activates the electrical accessory via the interface.

86. The apparatus according to claim 85, wherein the probe is a mechanical probe, configured to be placed in mechanical communication with the selector, and wherein the sensor is configured to be installed on the receiver in a manner that mechanically engages the probe with the selector.

87. The apparatus according to claim 86, wherein the lever is a first lever, and the selector includes a second lever opposite the first lever, and wherein the sensor is configured to be installed on the receiver in a manner that mechanically engages the probe with the second lever.

88. The apparatus according to claim 87, wherein the probe defines a groove dimensioned to receive the second lever upon installation of the sensor on the receiver.

89. The apparatus according to claim 86, wherein the probe is configured to mechanically engage the block, and wherein the sensor is configured to be installed on the receiver in a manner that mechanically engages the probe with the block.

90. The apparatus according to claim 85, wherein the probe is a magnetic probe, configured to be placed in magnetic communication with the selector, and wherein the sensor is configured to be installed on the receiver in a manner that places the probe in magnetic communication with the selector.

91. Apparatus for use with a selective -fire firearm that has a receiver, a safe mode, a first firing mode, and a second firing mode, the apparatus comprising a selector lever that comprises: a lug that defines a fulcrum; a magnet, mounted eccentrically with respect to the fulcrum; and a thumbswitch extending from the lug, the lever configured to be installed on the receiver such that pivoting the thumbswitch around the fulcrum (i) rotates the lug about the fulcrum in a manner that selects between the safe mode, the first firing mode, and the second firing mode, and (ii) revolves the magnet around the fulcrum.

92. The apparatus according to claim 91, wherein: the apparatus comprises a selector, the lever being a lever of the selector, the selector further includes a block that defines a block axis, the lug is fastened to an end of the block such that the fulcrum lies on the block axis, and the thumbswitch extends radially away from the block axis such that pivoting the thumbswitch around the block axis (i) rotates the block about the block axis, and (ii) revolves the magnet around the block axis, and the block is configured to be disposed transversely through the receiver such that rotation of the block about the block axis selects between the safe mode, the first firing mode, and the second firing mode.

93. The apparatus according to any one of claims 91-92, wherein the magnet is mounted on the lug.

94. The apparatus according to any one of claims 91-92, wherein the magnet is mounted on the thumbswitch.

95. The apparatus according to any one of claims 91-94, wherein: the lever is for use as a second lever of a selector of the firearm, the selector including(i) a block that defines a block axis and that extends transversely through the receiver, and(ii) a first lever attached to the block and extending radially away from the block axis such that pivoting the first lever about the block axis rotates the block around the block axis to select between the safe mode, the first firing mode, and the second firing mode, and the lug is configured to be fastened to an opposite end of the block from the first lever such that the fulcrum lies on the block axis, the thumbswitch extends radially away from the block axis, and pivoting the thumbswitch around the fulcrum (i) rotates the block around the block axis to select between the safe mode, the first firing mode, and the second firing mode, and (ii) revolves the magnet around the block axis.

96. The apparatus according to claim 95, wherein the lever is a replacement second lever for the selector, for replacing an original second lever of the selector.

97. The apparatus according to claim 95, wherein the lug defines a threaded bolt via which the lug is fastenable to the opposite end of the block.

98. The apparatus according to claim 95, wherein the lug defines a ring through which a threaded bolt is receivable to fasten the lug to the opposite end of the block.

99. A system for use with an electrical accessory for the firearm, the system comprising: the apparatus of any one of claims 85-98, and a readiness-to-fire sensor: comprising: a case; an interface, configured to interface with the electrical accessory; and a probe, configured to be installed on the receiver in a manner in which: the probe is positioned to distinguish between positions of the magnet, andthe interface is in communication with the selector such that, in the first firing mode and the second firing mode but not in the safe mode, the sensor activates the electrical accessory via the interface.

100. The system according to claim 99, wherein the probe comprises a magnetic switch.

101. The system according to any one of claims 99-100, further comprising the electrical accessory.

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