one embodiment of a (14) rectangular holder and having the external shape which communicates securely at its (60) front end, (62) rear end, (64) sides and (66) base with (20) receiving section of stock whether internally, or externally with said (14) rectangular holder repeatedly removed and replaced, as desired. The (14) rectangular holder may contain any number of designs as to securely communicate with (20) receiving section of stock.

one embodiment of a (14) rectangular holder and having the external shape which communicates securely at its (60) front end, (62) rear end, (64) sides and (66) base with (20) receiving section of stock whether internally, or externally with said (14) rectangular holder repeatedly removed and replaced, as desired. The (14) rectangular holder may contain any number of designs as to securely communicate with (20) receiving section of stock.

A magazine-well adapter is disclosed for use in a conversion stock of an SKS type rifle which permits a standard AK-style detachable magazine (with fore and aft upper locking lugs) to be attached and detached. The adapter is configured such that it may be added to a conversion kit stock without reshaping said stock, incorporates the rigidity of a conversion kit stock to provide rigidity, and may be positioned accurately using the interior configuration of a conversion stock kit. Additionally, an upward-force release lever is disclosed by which a standard detachable box magazine may be released using less complex movements than current magazine release levers.

A magazine-well adapter is disclosed for use in a conversion stock of an SKS type rifle which permits a standard AK-style detachable magazine (with fore and aft upper locking lugs) to be attached and detached. The adapter is configured such that it may be added to a conversion kit stock without reshaping said stock, incorporates the rigidity of a conversion kit stock to provide rigidity, and may be positioned accurately using the interior configuration of a conversion stock kit. Additionally, an upward-force release lever is disclosed by which a standard detachable box magazine may be released using less complex movements than current magazine release levers.

A modular automatic or semiautomatic rifle. The rifle has a lower receiver assembly having a fire control assembly for firing the rifle. An upper receiver assembly is provided with a frame and a bolt carrier assembly configured for firing bullets of a predetermined caliber. The lower receiver has a mating interface configured for operably joining the lower receiver assembly to the upper receiver assembly, and for operably joining the lower receiver assembly to another upper receiver assembly different from the upper receiver assembly configured for firing bullets of the predetermined caliber. The other upper receiver assembly has a different frame and different bolt carrier assembly configured for firing bullets of a different predetermined caliber.

A modular automatic or semiautomatic rifle. The rifle has a lower receiver assembly having a fire control assembly for firing the rifle. An upper receiver assembly is provided with a frame and a bolt carrier assembly configured for firing bullets of a predetermined caliber. The lower receiver has a mating interface configured for operably joining the lower receiver assembly to the upper receiver assembly, and for operably joining the lower receiver assembly to another upper receiver assembly different from the upper receiver assembly configured for firing bullets of the predetermined caliber. The other upper receiver assembly has a different frame and different bolt carrier assembly configured for firing bullets of a different predetermined caliber.

A method authenticates a user before the user can remove or attach a component to a firearm. When the user is authenticated, the user can remove or attach a component to the firearm. The firearm prevents the removal or attachment of the component when the user is not authenticated.

A method authenticates a user before the user can remove or attach a component to a firearm. When the user is authenticated, the user can remove or attach a component to the firearm. The firearm prevents the removal or attachment of the component when the user is not authenticated.

The invention relates to a firearm, in particular for shooting cartridge ammunition, having at least one weapon chassis 3, a weapon system support 4, and a weapon system apparatus 5; at least the weapon chassis 3 and the weapon system support 4 have corresponding engagement means 10 provided in spacing patterns via which they can be axially positioned differently relative to each other.

A muzzle loading conversion system for a rifle having an upper and lower receiver. A barrel is slidingly secured to the upper receiver. A stationary bolt member is positioned within the upper receiver with a firing pin slidably received within a bolt opening. A breech plug mechanism is threadedly secured to the barrel within a barrel end section and the breech plug mechanism is adapted to receive a primer within a breech plug mechanism chamber which is in fluid communication with the bolt through opening. The breech plug mechanism is engaged with the bolt member within a breech plug member receiving chamber.