The present invention is for a rear takedown pin and a bolt catch for use in a firearm such as an AR-15. The rear takedown pin has an elongated recess, a track, a slot, and a spring along an elongated cylindrical body that allows an upper and lower receiver of a firearm, such as an AR-15, to disengage, while the pin remains in the upper and lower receiver holes, thereby allowing a user to quickly replace a magazine without the barrel of the firearm rotating away from the preset aimed position. The invention also includes a bolt catch that allows a user to toggle a release to keep a bolt in its open opinion as well as provides a retractable pin that complies with magazine release lock regulations so a user can quickly replace a spent magazine.

The present invention is for a rear takedown pin and a bolt catch for use in a firearm such as an AR-15. The rear takedown pin has an elongated recess, a track, a slot, and a spring along an elongated cylindrical body that allows an upper and lower receiver of a firearm, such as an AR-15, to disengage, while the pin remains in the upper and lower receiver holes, thereby allowing a user to quickly replace a magazine without the barrel of the firearm rotating away from the preset aimed position. The invention also includes a bolt catch that allows a user to toggle a release to keep a bolt in its open opinion as well as provides a retractable pin that complies with magazine release lock regulations so a user can quickly replace a spent magazine.

A toy gun includes a gun body (1), a slide (2), a slide stopper (3), a return spring (4), a retainer (5), and a rotary bullet supplier (6). The slide (2) is disposed on the gun body (1) and reciprocates against the gun body (1). The slide stopper (3) is pivotedly connected to the gun body (1) and arranged correspondingly to the slide (2). The return spring (4) elastically supports between the gun body (1) and the slide stopper (3). The retainer (5) is pivotedly connected to the gun body (1). An end of the retainer (5) engages with the slide stopper (3), and another end thereof connects with a first magnetic member (51). The rotary bullet supplier (6) is received in the gun body (1) and connects with a second magnetic member (61).

The present low pressure bolt carrier group is configured to maximize the axial force component, and minimize the radial force component, applied to both the bolt carrier and the bolt under low-pressure gas conditions, so that the two separate with greater acceleration and under greater force than a standard bolt carrier group when firing low-pressure ammunition. Thus, the present low-pressure bolt carrier group effectively and completely ejects the spent case and chambers the next round. These and other benefits are provided by the present low-pressure bolt carrier group comprising one or more of an increased piston bore diameter, an increased piston diameter, an increased flatness of the piston surface in the radial plane, and an increased stroke length of the piston by lengthening the cam pin slot. Therefore, the present low-pressure bolt carrier group solves long-persisting problems with standard bolt carrier groups when using low-pressure rounds.

A bolt hold open mechanism assembly is disclosed. The bolt hold open mechanism assembly contains a connector rod, a follower lever associated with the connector rod, a bolt stop associated with the connector rod, and a lifter lever comprising at least one protrusion configured to interact with a magazine follower.

A bolt hold open mechanism assembly is disclosed. The bolt hold open mechanism assembly contains a connector rod, a follower lever associated with the connector rod, a bolt stop associated with the connector rod, and a lifter lever comprising at least one protrusion configured to interact with a magazine follower.

A breech catch mechanism for automatic and semi-automatic pistols includes a catch (502) of a breech comprising two longitudinal rails (400, 401) that are attached to pistol body or to an inserted container at one end in a rotary way and at the other end they are connected with a bridge (402). One of the rails (400, 401) is provided with an internal projection (405) protruding into a space between the rails (400, 401). The mechanism further includes the breech provided with a feeding bridge (250) and a cartridge feeder (500) positioned under the internal projection (405) and configured to push, after feeding of the last cartridge, from below against the internal projection (405), thus tilting the breech catch (502) from its basic position upward to an upper position in which the breech leans with its feeding bridge (250) against an outer surface (408) of the bridge (402) of the catch (502) of the breech to lock the breech in the rear position.

A breech catch mechanism for automatic and semi-automatic pistols includes a catch (502) of a breech comprising two longitudinal rails (400, 401) that are attached to pistol body or to an inserted container at one end in a rotary way and at the other end they are connected with a bridge (402). One of the rails (400, 401) is provided with an internal projection (405) protruding into a space between the rails (400, 401). The mechanism further includes the breech provided with a feeding bridge (250) and a cartridge feeder (500) positioned under the internal projection (405) and configured to push, after feeding of the last cartridge, from below against the internal projection (405), thus tilting the breech catch (502) from its basic position upward to an upper position in which the breech leans with its feeding bridge (250) against an outer surface (408) of the bridge (402) of the catch (502) of the breech to lock the breech in the rear position.

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.