A dual upper receiver for use with a firearm is provided. The dual upper receiver includes a first receiver portion; and a second receiver portion coupled to the first receiver portion. The first receiver portion is configured to couple to a first barrel, a first lower receiver and a first buttstock. The second receiver portion is configured to couple to a second barrel, a second lower receiver and a second buttstock. In embodiments, the dual upper receiver is formed as a unitary body. The dual upper receiver as a unitary body may include the first receiver portion and the second receiver portion are formed from a same piece of material.

A firearm is disclosed that includes an improved trigger system with twin disconnectors that are each independently selectable and adjustable to provide different trigger pull weights. The trigger assembly may be operably controlled by the safety selector which defines several different shaped engaging surfaces that allow the operator to selectively choose which of the disconnectors to operate with the firearm.

A firearm is disclosed that includes an improved trigger system with twin disconnectors that are each independently selectable and adjustable to provide different trigger pull weights. The trigger assembly may be operably controlled by the safety selector which defines several different shaped engaging surfaces that allow the operator to selectively choose which of the disconnectors to operate with the firearm.

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 firearm with tilting barrel-receiver assembly includes a frame and a barrel-receiver assembly pivotably mounted to the frame. The barrel-receiver assembly is movable between an open position and a closed position. A latching mechanism includes a latch that selectively engages the barrel-receiver assembly. The latching mechanism may be disposed in the frame in one embodiment. The latching mechanism is movable between a locked position wherein the barrel-receiver assembly is held in the closed position and an unlocked position wherein the barrel-receiver assembly is movable to the tilted open position. The latch may be spring biased into the locked position. The barrel-receiver assembly may be configured for complete removal from the pistol in some embodiments. An interlock mechanism formed by a movable safety may be provided which prevents the barrel-receiver assembly from being unlocked when the firearm is in a ready-to-fire condition.

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.

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 self-stabilizing small arm having a barrel assembly rigidly connected to a stock assembly. The small arm includes at least one shooter interface surface and a stabilization assembly controlling the relative position of the shooter interface surface and the barrel assembly or stock assembly. The stabilization assembly includes (i) at least one movement sensor; (ii) at least one actuator; and (iii) a controller using signals from the movement sensor to operate the actuator in order to compensate for unintended movement of the small arm.

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.