Abstract: A pistol chassis is disclosed which may include a lower housing, an upper housing, a proximal enclosure, a distal sleeve, and a proximal accessory. The distal sleeve, lower housing, and upper housing may be secured together to form a tubular member for receiving a pistol. The lower housing further may include a distal segment, a proximal segment and an intermediate segment. Time distal segment may include a pistol frame receptacle and a trigger guard enclosure. The proximal accessory may be a folding stock. The pistol chassis may house a pistol to produce a firearm apparatus.

Abstract: A magazine extension may include a body for storing firearm ammunition. The body may include an upper end portion which includes a seat for part of a firearm. The upper end portion further may include a magazine casing receiving groove. Also, the body may include a lower end portion, and an exterior surface extending from the upper end portion to the lower end portion, as well as an opening extending into the body. The body may include a bench inside the opening. A magazine extension follower may be disposed above the bench. The magazine extension follower may include an upper surface, a lower surface, and a side wall. The magazine extension follower may form an ammunition magazine spring bearing surface. The magazine extension may include a resilient member disposed between the magazine extension follower and the bench which biases the magazine extension follower away from the lower end.

Abstract: A holster body for a gun which may be configurable for left or right dominant hand use and a retention system which may be used with the holster body to form a plurality of retention holster configurations including, without limitation, a Level I retention holster configuration and a Level II retention holster configuration.

Abstract: A cover for a receiver of a gun that may include an elongated member having a first longitudinal axis, the elongated member including a distal end portion which may include a leading edge which is configured and dimensioned to connect with a gun part, and a proximal end portion which is spaced from the distal end portion along the first longitudinal axis. The elongated member may include a first locking mechanism adjacent the proximal end wall. The first locking mechanism may be secured to a recoil spring guide of the gun. Also, the elongated member may include a second locking mechanism adjacent the distal end portion. The second locking mechanism may be secured to a rear sight base of the gun. The elongated member may include an accessory rail.

Abstract: A pistol grip bipod for a gun may include a bipod assembly that can be attached to a pistol grip of a gun. The bipod assembly may include a housing, a chassis, a port side leg including a port side foot, a starboard side leg including a starboard foot. The bipod assembly further may include first and second operable states such that in the first operational state, the port side foot and the starboard side foot are secured in the housing below the pistol grip, and such that in the second operable configuration the port side foot and the starboard side foot are unlatched from the housing and the port side foot and the starboard side foot are positioned in front of the housing. The pistol grip bipod may be deployed by an operator's dominant hand which remains secured to the pistol grip.

Abstract: A replacement grip for a Makarov pistol which include a body. The body may include a first lever connected to a first interior side wall, the first lever may a first end portion adjacent the top end portion of the body and a second end portion, proximate the bottom end portion. The second end portion may include a projection extending toward a second interior side wall. The first lever may be movable about between a first position and a second position such that in the first position the projection is spaced a first distance from the third interior side wall, and such that in the second position the projection is spaced a second distance from the third interior side wall, the second distance being less than the first distance. When installed on a Makarov pistol, the first lever may be used to release the magazine catch.

Abstract: A magazine for storing and feeding ammunition cartridges to a small arms weapon which comprises a casing, a floor plate, a follower, and a magazine spring inside the casing. The magazine spring may comprise a first end connected to the follower, a second end connected to the floor plate, and a plurality of coils. Each of the plurality of coils may include a first segment having a first radius, a second segment having a first length adjoining the first segment, a third segment having a second radius adjoining the second segment, the second radius being greater than the first radius, and a fourth segment having a second length adjoining the third segment, the second length being approximately equal to the first length.

Abstract: A cover for a receiver of a gun that may include an elongated member having a first longitudinal axis, the elongated member including a distal end portion which may include a leading edge which is configured and dimensioned to connect with a gun part, and a proximal end portion which is spaced from the distal end portion along the first longitudinal axis. The elongated member may include a first locking mechanism adjacent the proximal end wall. The first locking mechanism may be secured to a recoil spring guide of the gun. Also, the elongated member may include a second locking mechanism adjacent the distal end portion. The second locking mechanism may be secured to a rear sight base of the gun. The elongated member may include an accessory rail.

Abstract: A magazine for storing and feeding ammunition cartridges to a small arms weapon which comprises a casing, a floor plate, a follower, and a magazine spring inside the casing. The magazine spring may comprise a first end connected to the follower, a second end connected to the floor plate, and a plurality of coils. Each of the plurality of coils may include a first segment having a first radius, a second segment having a first length adjoining the first segment, a third segment having a second radius adjoining the second segment, the second radius being greater than the first radius, and a fourth segment having a second length adjoining the third segment, the second length being approximately equal to the first length.

Abstract: A magazine extension may include a body for storing firearm ammunition. The body may include an upper end portion which includes a seat for part of a firearm. The upper end portion further may include a magazine casing receiving groove. Also, the body may include a lower end portion, and an exterior surface extending from the upper end portion to the lower end portion, as well as an opening extending into the body. The body may include a bench inside the opening. A magazine extension follower may be disposed above the bench. The magazine extension follower may include an upper surface, a lower surface, and a side wall. The magazine extension follower may form an ammunition magazine spring bearing surface. The magazine extension may include a resilient member disposed between the magazine extension follower and the bench which biases the magazine extension follower away from the lower end.

Abstract: A magazine for storing and feeding ammunition cartridges to a small arms weapon which comprises a casing, a floor plate, a follower, and a magazine spring inside the casing. The magazine spring may comprise a first end connected to the follower, a second end connected to the floor plate, and a plurality of coils. Each of the plurality of coils may include a first segment having a first radius, a second segment having a first length adjoining the first segment, a third segment having a second radius adjoining the second segment, the second radius being greater than the first radius, and a fourth segment having a second length adjoining the third segment, the second length being approximately equal to the first length.

Abstract: A holster body for a gun which may be configurable for left or right dominant hand use and a retention system which may be used with the holster body to form a plurality of retention holster configurations including, without limitation, a Level I retention holster configuration and a Level II retention holster configuration.

Abstract: A holster body for a gun which may be configurable for left or right dominant hand use and a retention system which may be used with the holster body to form a plurality of retention holster configurations including, without limitation, a Level I retention holster configuration and a Level II retention holster configuration.

Abstract: A replacement grip for a Makarov pistol which include a body. The body may include a first lever connected to a first interior side wall, the first lever may a first end portion adjacent the top end portion of the body and a second end portion, proximate the bottom end portion. The second end portion may include a projection extending toward a second interior side wall. The first lever may be movable about between a first position and a second position such that in the first position the projection is spaced a first distance from the third interior side wall, and such that in the second position the projection is spaced a second distance from the third interior side wall, the second distance being less than the first distance. When installed on a Makarov pistol, the first lever may be used to release the magazine catch.

Abstract: A cover for a receiver of a gun that may include an elongated member having a first longitudinal axis, the elongated member including a distal end portion which may include a leading edge which is configured and dimensioned to connect with a gun part, and a proximal end portion which is spaced from the distal end portion along the first longitudinal axis. The elongated member may include a first locking mechanism adjacent the proximal end wall. The first locking mechanism may be secured to a recoil spring guide of the gun. Also, the elongated member may include a second locking mechanism adjacent the distal end portion. The second locking mechanism may be secured to a rear sight base of the gun. The elongated member may include an accessory rail.

Abstract: A pistol grip bipod for a gun may include a bipod assembly that can be attached to a pistol grip of a gun. The bipod assembly may include a housing, a chassis, a port side leg including a port side foot, a starboard side leg including a starboard foot. The bipod assembly further may include first and second operable states such that in the first operational state, the port side foot and the starboard side foot are secured in the housing below the pistol grip, and such that in the second operable configuration the port side foot and the starboard side foot are unlatched from the housing and the port side foot and the starboard side foot are positioned in front of the housing. The pistol grip bipod may be deployed by an operator's dominant hand which remains secured to the pistol grip.

Abstract: A pistol grip bipod for a gun may include a bipod assembly that can be attached to a pistol grip of a gun. The bipod assembly may include a housing, a chassis, a port side leg including a port side foot, a starboard side leg including a starboard foot. The bipod assembly further may include first and second operable states such that in the first operational state, the port side foot and the starboard side foot are secured in the housing below the pistol grip, and such that in the second operable configuration the port side foot and the starboard side foot are unlatched from the housing and the port side foot and the starboard side foot are positioned in front of the housing. The pistol grip bipod may be deployed by an operator's dominant hand which remains secured to the pistol grip.

Abstract: A magazine for storing and feeding ammunition cartridges to a small arms weapon which comprises a casing, a floor plate, a follower, and a magazine spring inside the casing. The magazine spring may comprise a first end connected to the follower, a second end connected to the floor plate, and a plurality of coils. Each of the plurality of coils may include a first segment having a first radius, a second segment having a first length adjoining the first segment, a third segment having a second radius adjoining the second segment, the second radius being greater than the first radius, and a fourth segment having a second length adjoining the third segment, the second length being approximately equal to the first length.