Bolt catches for firearms, receivers for firearms configured to receive the bolt catches, and firearms including the disclosed receivers and bolt catches. The disclosed bolt catches have a first bolt catch lever having a center element defining an undercut recess configured to optionally receive a connection section of a second bolt catch lever, and a biasing element configured to urge the first bolt catch lever into an idle position; the disclosed receivers are configured to receive the disclosed bolt catches, and the disclosed firearms include a receiver, and a grip and/or a stock, provided that the receiver defines a recess for receiving a second bolt catch lever and/or a plug.

The present disclosure provides ammunition magazines and hold-open bolt carriers for using low-cost (e.g., 22LR) ammunition in a standard AR-15 or M16 upper receiver.

Provided is a fast cycling/low recoil pistol caliber carbine assembly. The carbine assembly may include an upper receiver, a lower receiver, a feed ramp, a bolt stop, a magazine, a control mechanism comprising a control lever, a control base, a control pivot pin, and a control spring, an ejector, a gap filler member. The assembly provides last round bolt hold open, trigger finger actuated bolt release, short stroke cycle, barrel ramp, ambidextrous magazine release, and uses Glock magazines.

Provided is a fast cycling/low recoil pistol caliber carbine assembly. The carbine assembly may include an upper receiver, a lower receiver, a feed ramp, a bolt stop, a magazine, a control mechanism comprising a control lever, a control base, a control pivot pin, and a control spring, an ejector, a gap filler member. The assembly provides last round bolt hold open, trigger finger actuated bolt release, short stroke cycle, barrel ramp, ambidextrous magazine release, and uses Glock magazines.

A cutting-power-off detection structure of a toy gun has a main structure that includes a gun body, a muzzle defined at one side of the gun body, a feeding channel defined in the gun body, a chamber defined in the gun body and in communication with the muzzle and the feeding channel, a circuit device arranged in the gun body, at least one wireless detection device arranged in the gun body and electrically connected with the circuit device, and a shot forwarding device arranged in the chamber and electrically connected with the circuit device. The feeding channel is connectable to a magazine and the wireless detection device is operable to detect a shot fed from the magazine. When the magazine runs out of shots and the wireless detection device detects no shot, a signal is transmitted to the circuit device to cut off electricity supplied to the shot forwarding device.

Systems and methods are provided for the making safe of a handgun. A safety system includes a lock mechanism coupled to an engagement member and a user interface. The engagement member is movably coupled to the handgun and includes a contact face that is in contact with the slide of the handgun. The engagement member transfers a portion of a force to the slide and moves between a lock position and an unlock position. The lock position corresponds to a separation distance between a distal end of a primer actuator of the handgun and a primer activation plane. The engagement member is configured to transition between the lock position and the unlock position while remaining movably coupled to the handgun. Movement of the engagement member from the lock position is restricted by the lock mechanism until disengaged via the user interface.

A firearm receiver assembly includes a receiver body, a threaded mount at a rear portion of the receiver body, a magazine release assembly including a magazine release portion on at least one side of the receiver body, a bolt release assembly including a bolt release central portion and a bolt release portion on at least one side of the receiver body, and a safety selector assembly including a safety portion on at least one side of the receiver body. The bolt release central portion translates vertically within a cavity of the receiver body.

A last round hold open (LRHO) apparatus comprising a first lever having a first end and a second end; a second lever having a first end and a second end, the first end of the second lever in contact with the second end of the first lever; a bolt catch in contact with the second end of the second lever, and with a bolt carrier; and a follower in contact with the first end of the first lever, such that when the follower pushes up on the first end of the first lever, the second end of the first lever pushes down on the first end of the second lever, and the second end of the second lever pushes up on the bolt catch, resulting in activation of the bolt catch and opening the bolt carrier to alert an operator of the firearm that the firearm is out of ammunition.

A last round hold open (LRHO) apparatus comprising a first lever having a first end and a second end; a second lever having a first end and a second end, the first end of the second lever in contact with the second end of the first lever; a bolt catch in contact with the second end of the second lever, and with a bolt carrier; and a follower in contact with the first end of the first lever, such that when the follower pushes up on the first end of the first lever, the second end of the first lever pushes down on the first end of the second lever, and the second end of the second lever pushes up on the bolt catch, resulting in activation of the bolt catch and opening the bolt carrier to alert an operator of the firearm that the firearm is out of ammunition.

Provided is a last round bolt hold-open mechanism for a firearm with a removable ammunition magazine and a longitudinally reciprocating bolt that automatically releases the bolt when a loaded ammunition magazine is inserted. The mechanism includes a frame mountable to a firearm receiver and having a pair of mounting flanges. A catch member is pivotally mounted on a pivot axle oriented transverse to the longitudinal reciprocation of the bolt and carried by the mounting flanges. The catch member has a rearward portion that moves between bolt blocking and bolt release positions and is spring biased toward the bolt blocking position. A forwardly extending finger is configured to be lifted by the presence of at least one ammunition cartridge in the magazine and, when lifted, causes the catch member to pivot to the bolt release position.