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.

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.

A number of embodiments of a firearm are disclosed where the firearm includes a magazine configured to hold the bolt in an open position when the magazine is empty. In one embodiment, the firearm includes a bolt stop mechanism that moves between a first position where it allows the bolt to cycle between an open position and a closed position and a second position where it holds the bolt in the open position. The magazine is configured to actuate the bolt stop mechanism to the first position when the magazine is empty.

A number of embodiments of a firearm are disclosed where the firearm includes a magazine configured to hold the bolt in an open position when the magazine is empty. In one embodiment, the firearm includes a bolt stop mechanism that moves between a first position where it allows the bolt to cycle between an open position and a closed position and a second position where it holds the bolt in the open position. The magazine is configured to actuate the bolt stop mechanism to the first position when the magazine is empty.

The present invention discloses enhancements for a follower within a magazine for an automatic rifle. The disclosed follower contains mechanisms that will (i) disengage the magazine from the automatic rifle once the last round has been removed from the magazine; (ii) minimize the amount of friction between the follower and the inner wall of the magazine; and (iii) detect if the automatic rifle has been breeched prior to disengaging the magazine from the automatic rifle. The disclosure also provides for a takedown pin that will have selectable positions to allow for a full breech, partial breech, and a normal firing mode.

A bolt catch device is disclosed. The bolt catch includes a movable surface configured to be positioned within a weapon so as to conditionally engage a bolt so as to prevent the bolt from rechambering a next round from a magazine, a tip configured to, in response to a received force, cause the movable surface to move so as to release the bolt, and a spring engagement feature configured to be positioned within the weapon so as to receive a spring within the weapon, wherein the spring within the weapon is configured to bias the movable surface toward a position which prevents the bolt from rechambering a next round.

A bolt catch device is disclosed. The bolt catch includes a movable surface configured to be positioned within a weapon so as to conditionally engage a bolt so as to prevent the bolt from rechambering a next round from a magazine, a tip configured to, in response to a received force, cause the movable surface to move so as to release the bolt, and a spring engagement feature configured to be positioned within the weapon so as to receive a spring within the weapon, wherein the spring within the weapon is configured to bias the movable surface toward a position which prevents the bolt from rechambering a next round.

A replaceable slide notch system for a firearm that includes a replaceable slide notch component dimensioned to fit within a corresponding cavity of a slide. The replaceable slide notch component includes a slide lock notch surface that locks the slide when the firearm's ammunition is exhausted. A second replaceable slide notch component has a second slide lock notch surface that locks the slide at a further rearward position than that of the first slide notch component, thus providing greater chambering/operating force when the slide is released.

A replaceable slide notch system for a firearm that includes a replaceable slide notch component dimensioned to fit within a corresponding cavity of a slide. The replaceable slide notch component includes a slide lock notch surface that locks the slide when the firearm's ammunition is exhausted. A second replaceable slide notch component has a second slide lock notch surface that locks the slide at a further rearward position than that of the first slide notch component, thus providing greater chambering/operating force when the slide is released.

This disclosure describes systems, methods, and apparatus for a follower assembly comprising one or more dummy cartridges, the first thereof comprising an angled follower platform that when pressed between the follower spring and a final live cartridge in the magazine, rotates to a first side of the magazine and enhances follower interaction with a slide lock mechanism. The follower platform may also be angled back to front to further enhance this interaction. The follower platform may include a protruding heel extending laterally from a front portion of the first side of the follower platform configured to interface with the slide lock mechanism. A rear stop may extend from a rear portion of the first side and interface with a downward-facing surface of the magazine near the feed end, wherein contact between these two surfaces causes a front end of the first dummy cartridge to rotate upward.