A firearm synchronized discharge device for facilitating a synchronized discharge of two or more firearms are described together with associated systems, firearms and methods. The device includes an actuator for engaging with a movable trigger of a first firearm, a sensor configured to generate a signal indicative of a force applied to the trigger and a first controller operatively coupled to the sensor and to the actuator. The actuator is configurable between a first configuration that prevents movement of the trigger toward a firearm-discharge position of the trigger, and a second configuration that permits movement of the trigger toward the firearm-discharge position of the trigger. When the force meets a criterion and the one or more other firearms are ready for discharge, the actuator is caused to transition from the first configuration to the second configuration to permit actuation of the trigger and discharge of the firearm.

A grenade launcher may include at least one barrel for receiving a grenade, a support for releasably mounting the grenade launcher to a carrier, and a receiving slot receiving a removable primer cartridge. The primer cartridge when received in the receiving slot may hold a primer in position for firing the grenade in the barrel.

A grenade launcher may include at least one barrel for receiving a grenade, a support for releasably mounting the grenade launcher to a carrier, and a receiving slot receiving a removable primer cartridge. The primer cartridge when received in the receiving slot may hold a primer in position for firing the grenade in the barrel.

A secondary firearm with a rail mount attachable to a rail assembly of a primary firearm is disclosed. The secondary firearm comprises a body having at least one retaining pin hole and a bolt stop hole and a housing disposed about the body. The housing comprises at least one retaining pin aperture and/or a bolt stop aperture. The secondary firearm also includes at least one fastener disposed within at least one of the at least one retaining pin aperture and the at least one retaining pin hole and/or the bolt stop aperture and the bolt stop hole to fasten the housing to the body.

Firearm bolt assemblies and firearms including the same are described. In embodiments the firearm bolt assemblies are configured to localize compressive forces applied during a transition from an initial position to a firing position to a first cam system on one side of the firearm bolt assembly, and to localize compressive forces applied during a transition from the firing position to the initial position to a second cam system another side of the firearm bolt assembly. Localizing the forces in that manner enables the use of a first cam system that is relatively robust compared to the second cam system.

This invention relates to a single hand cranked firing control system that converts a plurality of AR 15 rifles to a single hand cranked firing system. The system is operated by a single hand crank. The triggering of the guns has a slight time difference that results in a slight time difference in firing operation of the guns. The system comprises a single hand crank for the firing operation of the guns.

A machine gun top cover assembly includes a top cover door attached to a main housing. The top cover assembly defines a rear transverse track section and a front transverse track section for guiding bolt assemblies of the gun. As the machine gun rotor assembly rotates, the rear track section prevents the bolt assemblies from moving into position for firing, and the front track section guides the bolt assemblies into position for firing. A selector switch on the top cover door selects between: (i) a safe position wherein, each of the bolt assemblies are sequentially directed into the rear track section; and (ii) a fire position wherein the bolt assemblies are directed into the front track section. The top cover assembly can include a solenoid for moving the selector switch between the safe position and the fire position in response to an electrical control signal.

A machine gun top cover assembly includes a top cover door attached to a main housing. The top cover assembly defines a rear transverse track section and a front transverse track section for guiding bolt assemblies of the gun. As the machine gun rotor assembly rotates, the rear track section prevents the bolt assemblies from moving into position for firing, and the front track section guides the bolt assemblies into position for firing. A selector switch on the top cover door selects between: (i) a safe position wherein, each of the bolt assemblies are sequentially directed into the rear track section; and (ii) a fire position wherein the bolt assemblies are directed into the front track section. The top cover assembly can include a solenoid for moving the selector switch between the safe position and the fire position in response to an electrical control signal.

A double crossbow with a single trigger mechanism is provided. The double crossbow comprises a barrel, an upper bow, a lower bow, and a single trigger mechanism. The upper bow and the lower bow are positioned on top of each other at a distal end of the barrel. The single trigger mechanism positioned at a proximal end of the barrel is configured to shoot two arrows in succession without reloading an arrow between two shots. A first arrow is shot from the upper bow when a single trigger of the single trigger mechanism is squeezed completely a first time, and the second arrow is shot from the lower bow when the single trigger of the single trigger mechanism is squeezed completely a second time. The single trigger mechanism is configured to not shoot the first arrow and the second arrow simultaneously.

Firearm bolt assemblies and firearms including the same are described. In embodiments the firearm bolt assemblies are configured to localize compressive forces applied during a transition from an initial position to a firing position to a first cam system on one side of the firearm bolt assembly, and to localize compressive forces applied during a transition from the firing position to the initial position to a second cam system another side of the firearm bolt assembly. Localizing the forces in that manner enables the use of a first cam system that is relatively robust compared to the second cam system.