Abstract: A rifle with tapered interfaces has a receiver, a barrel extension connected to the receiver at a first interface, a barrel connected to the barrel extension at a second interface, a barrel nut element connected to the barrel extension at a third interface and to the barrel at a fourth interface, and at least two of the first, second, third, and fourth interfaces being tapered interfaces. The tapered interfaces may be stably tapered such that a wedging effect is generated. The barrel extension may have two tapered interfaces. The barrel extension may have a forward external tapered interface connecting to the barrel nut element and a forward internal tapered interface connecting to the barrel.

Abstract: A rifle with tapered interfaces has a receiver, a barrel extension connected to the receiver at a first interface, a barrel connected to the barrel extension at a second interface, a barrel nut element connected to the barrel extension at a third interface and to the barrel at a fourth interface, and at least two of the first, second, third, and fourth interfaces being tapered interfaces. The tapered interfaces may be stably tapered such that a wedging effect is generated. The barrel extension may have two tapered interfaces. The barrel extension may have a forward external tapered interface connecting to the barrel nut element and a forward internal tapered interface connecting to the barrel.

Abstract: A rifle with tapered interfaces has a receiver, a barrel extension connected to the receiver at a first interface, a barrel connected to the barrel extension at a second interface, a barrel nut element connected to the barrel extension at a third interface and to the barrel at a fourth interface, and at least two of the first, second, third, and fourth interfaces being tapered interfaces. The tapered interfaces may be stably tapered such that a wedging effect is generated. The barrel extension may have two tapered interfaces. The barrel extension may have a forward external tapered interface connecting to the barrel nut element and a forward internal tapered interface connecting to the barrel.

Abstract: A firearm assembly has a barrel and a barrel receiving unit for receiving the barrel. A primary barrel nut is disposed over the barrel and mating with the barrel receiving unit. A primary end of the barrel is mated to a barrel extension. The primary barrel nut has an internal shoulder making contact with a shoulder of the barrel extension. A secondary barrel nut is disposed over the barrel and mating with the primary barrel nut to align the barrel with the barrel receiving unit. The internal shoulder of the primary barrel nut and the shoulder of the barrel extension can be flat or beveled. The secondary barrel nut has an internal shoulder contacting a shoulder of the barrel. The internal shoulder of the secondary barrel nut and the shoulder of the barrel are beveled or tapered.

Abstract: A firearm trigger assembly has a trigger housing including a first opening and second opening through a surface of the trigger housing. A trigger assembly is disposed partially within the trigger housing. The trigger assembly has a trigger body with a trigger pull disposed within the trigger housing, disconnector in contact with the trigger body, and hammer body rotationally connected to the trigger body and latchable to the trigger body. A first limit stop, such as a first set screw, is disposed through the first opening and contacts the trigger body to stop movement of the trigger assembly in the first direction, and a second limit stop, such as a second set screw, is disposed through the second opening and contacts the trigger body to stop movement of the trigger assembly in the second direction. The trigger body has a concave surface adapted to receive a safety selector.

Abstract: A firearm mounting system has an L-bracket and a mounting support coupled to a first surface of the L-bracket and adapted to rotate in a first direction. The mounting support has a shaft and a bearing disposed on the shaft extending through a first opening in the body and a second opening in the L-bracket and the bearing is disposed within the first opening. The mounting support has a fixed riser and a tensioning bar and a cam lock extending through the fixed riser and tensioning bar. A base assembly is coupled to a second surface of the L-bracket and adapted to rotate in a first direction. The base assembly has a shaft and a bearing disposed on the shaft extending through a first opening in the base body and a second opening in of the L-bracket and the bearing is disposed within the first opening.

Abstract: A firearm has a lower receiver with a first channel formed in a first surface of the lower receiver, and an upper receiver attached to the lower receiver at a pivot point. A compressible material is disposed within the first channel between the upper receiver and lower receiver. The upper receiver compresses the compressible material when the upper receiver closes onto the lower receiver. A recess can be formed within the first channel and extends into the lower receiver deeper than the first channel. A second channel is formed in a second surface of the lower receiver. Alternatively, the lower receiver has a slot formed in a surface of the lower receiver, and the compressible material is disposed within the slot. The slot includes a bottom surface and vertical surface extending from the bottom surface to the surface of the lower receiver, and rounded ends.

Abstract: A firearm has a lower receiver with a first channel formed in a first surface of the lower receiver, and an upper receiver attached to the lower receiver at a pivot point. A compressible material is disposed within the first channel between the upper receiver and lower receiver. The upper receiver compresses the compressible material when the upper receiver closes onto the lower receiver. A recess can be formed within the first channel and extends into the lower receiver deeper than the first channel. A second channel is formed in a second surface of the lower receiver. Alternatively, the lower receiver has a slot formed in a surface of the lower receiver, and the compressible material is disposed within the slot. The slot includes a bottom surface and vertical surface extending from the bottom surface to the surface of the lower receiver, and rounded ends.