Abstract: A firearm cartridge ejector system is disclosed that may include a bolt or a bolt carrier group, and an ejector that may be configured to eject an ammunition cartridge from the firearm bolt or bolt carrier group. The ejector may further include a stem configured to engage an ejector spring, and an ejector face that may be reniform-shaped and attached to the stem and configured to engage and eject the ammunition cartridge.

Abstract: An improved trigger assembly for a firearm includes 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.

Abstract: A firearm having a gas piston system includes a bolt carrier, an adjustable gas piston block located forward on the firearm and an over-the-barrel spring and guide rod arrangement, all of which is housed and contained in a top rail that runs the length of the firearm and that maintains the alignment of these firearm components. The firearm also includes an ambidextrous, non-reciprocating charging handle located forward on the firearm and positioned within the top rail for charging the firearm.

Abstract: An AR-style firearm includes a specially designed lower receiver, a specially designed upper receiver mounted to the lower receiver, a hand grip mounted to the lower receiver, a handguard mounted around a barrel, a specially designed magazine well formed in the lower receiver that is configured to receive an AK-47 magazine or similar magazine, and a specially designed, ambidextrous magazine release that holds and selectively releases the magazine from the magazine well.

Abstract: 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.

Abstract: A firearm includes an integrated rail and sight system that slidably mounts to the top of the firearm and is also retractable and detachable from the firearm. The rail may slide on and off the top of the firearm and may include integrated front and rear flip down sights. Both sights are pinned to the rail and can fold down to the rail such that they are flush with or seat below the top portion of the rail. This permits accessories to be mounted to the rail without the sights interfering with the mounting of the accessories or without the sights interfering with the operation of the accessories. The firearm further includes an ambidextrous charging handle mounted through the integrated rail and sight system.

Abstract: An AR-style firearm includes a specially designed lower receiver, a specially designed upper receiver mounted to the lower receiver, a hand grip mounted to the lower receiver, a handguard mounted around a barrel, a specially designed magazine well formed in the lower receiver that is configured to receive an AK-47 magazine or similar magazine, and a specially designed, ambidextrous magazine release that holds and selectively releases the magazine from the magazine well.

Abstract: A firearm having a gas piston system includes a bolt carrier, an adjustable gas piston block located forward on the firearm and an over-the-barrel spring and guide rod arrangement, all of which is housed and contained in a top rail that runs the length of the firearm and that maintains the alignment of these firearm components. The firearm also includes an ambidextrous, non-reciprocating charging handle located forward on the firearm and positioned within the top rail for charging the firearm.

Abstract: An AR-style firearm includes a specially designed lower receiver, a specially designed upper receiver mounted to the lower receiver, a pistol hand grip mounted to the lower receiver, a handguard mounted around a barrel, a specially designed magazine well formed in the lower receiver that is configured to receive an AK-47 magazine or similar magazine, and a specially designed, ambidextrous magazine release that holds and selectively releases the magazine from the magazine well.

Abstract: A magazine for a firearm includes a body having a bottom end, a feed end side walls, first and second end walls, a channel on the first end wall, and vertically extending side ridges on the side walls; and a follower including a ridge configured to mate with the channel in the first end wall of the body; a plurality of vertically extending side channels configured to mate with the side ridges of the body; and an arcuate feed surface with an end point of a radius defining the arcuate feed surface being laterally offset from a vertically extending centerline of the follower; and a biasing member configured to urge the follower away from the bottom end.

Abstract: A firearm muzzle brake may include a substantially cylindrical hollow first portion having a first end and a second end; a pair of opposed rows of slots extending through the first portion, each row extending axially along a side of the first portion; a pair of rows of ports extending through the first portion, each row extending axially along the first portion above one of the rows of slots; and a second portion having a first end received in the second end of the first portion, a second end, a central aperture extending through the second portion and being in fluid communication with the hollow first portion such that a bullet can pass through the first and second portions.

Abstract: A handguard or other cover for a firearm includes a shell or body with a hollow interior cavity and a retaining structure configured to engage the forearm and retain the shell in place on the forearm, where the retaining structure is releasable to permit removal of the shell from the forearm. The shell may have a concave inner surface and a convex outer surface extending between the first and second edges. The concave inner surface may include at least one tab extending outwardly from the inner surface which is configured to be connected to a slot or opening formed in the forearm for the firearm.

Abstract: A firearm muzzle brake may include a substantially cylindrical hollow first portion having a first end and a second end; a pair of opposed rows of slots extending through the first portion, each row extending axially along a side of the first portion; a pair of rows of ports extending through the first portion, each row extending axially along the first portion above one of the rows of slots; and a second portion having a first end received in the second end of the first portion, a second end, a central aperture extending through the second portion and being in fluid communication with the hollow first portion such that a bullet can pass through the first and second portions.