Abstract: An upper receiver is disclosed. The firearm contains a bolt carrier assembly positioned within the upper receiver, a recoil spring guide rod, wherein the bolt carrier assembly is configured to slide along the recoil spring guide rod between a locked position and an unlocked position, and a first recoil spring, wherein the recoil spring guide rod is positioned within the first recoil spring.

Abstract: A thumb safety mechanism is disclosed. The thumb safety mechanism contains a first main body containing an inner side surface, a pivot member containing a first end coupled with the inner side surface of the first main body by a fastener; and an engagement member protruding from the inner side surface of the first main body.

Abstract: A expansion chamber assembly for a firearm is disclosed. The expansion chamber contains an outer tube containing a front end and a rear end, a front cap coupled with the outer tube at the front end, a rear cap coupled with the outer tube at the rear end, an inner tube retained within the outer tube by the front cap and the rear cap, wherein the inner cap contains one or more through apertures to allow expanding gasses to move from the inner tube into the outer tube, and one or more exit apertures to allow expensing gases to exit the expansion chamber assembly.

Abstract: An upper receiver assembly of a firearm is disclosed. The upper receiver assembly contains a barrel, an extension block removably coupled with the barrel, an upper receiver removably coupled with the extension block, a handguard mounting block removably coupled with the barrel, and a handguard removably coupled with the handguard mounting block.

Abstract: A forward charging system is disclosed. The forward charging system contains a charging trolley containing one or more channels configured to accommodate one or more rails associated with a hand guard, wherein the charging trolley is movable along the one or more rails between a rest position and a charging position, and a rod coupled to a rear portion of the charging trolley, the rod is configured to move a bolt carrier assembly away from a locked position when the charging trolley is moved away from the rest position.

Abstract: An upper receiver assembly of a firearm is disclosed. The upper receiver assembly contains a barrel, an extension block removably coupled with the barrel, an upper receiver removably coupled with the extension block, a handguard mounting block removably coupled with the barrel, and a handguard removably coupled with the handguard mounting block.

Abstract: A backstrap assembly is disclosed.

Abstract: A handgun is disclosed. The handgun contains a frame composed of polymer material, the frame contains a channel formed therein, wherein the channel contains sides, and a forward rail positioned within the channel.

Abstract: A bolt hold open mechanism assembly is disclosed. The bolt hold open mechanism assembly contains a connector rod, a follower lever associated with the connector rod, a bolt stop associated with the connector rod, and a lifter lever comprising at least one protrusion configured to interact with a magazine follower.

Abstract: A forward charging system is disclosed. The forward charging system contains a charging trolley containing one or more channels configured to accommodate one or more rails associated with a hand guard, wherein the charging trolley is movable along the one or more rails between a rest position and a charging position, and a rod coupled to a rear portion of the charging trolley, the rod is configured to move a bolt carrier assembly away from a locked position when the charging trolley is moved away from the rest position.

Abstract: A firearm is disclosed. The firearm contains a lower receiver containing a first opening, wherein the first opening is configured to accommodate a firing mechanism, an upper receiver removably coupled with the lower receiver, a barrel removably coupled with the upper receiver, a bolt carrier assembly positioned within the upper receiver, wherein the bolt carrier assembly is movable between a locked position and an unlocked position, wherein the bolt carrier assembly contains a rear surface, wherein the rear surface of the bolt carrier assembly is positioned between the barrel and the first opening when the bolt carrier assembly is in the locked position.

Abstract: The handgun contains a frame composed of polymer material, the frame contains a channel formed therein, wherein the channel contains sides, and a forward rail positioned within the channel.

Abstract: A backstrap assembly is disclosed. The backstrap assembly contains a cavity sized to retain a main spring cap, a main spring retainer, a main spring, and a lower end of a strut, and an opening for a pin, wherein the pin retains the main spring cap, the main spring retainer, and the main spring in the cavity.

Abstract: A fire control assembly and a method are disclosed. The fire control assembly contains a pivotable shaft containing a first end and a second end, and a first selector member removably coupled with the first end of the pivotable shaft, wherein the first selector member is movable between a first position relative to the pivotable shaft and a second position relative to the pivotable shaft, wherein the first selector member is configured to rotate the pivotable shaft from a safe position to a firing position and back to the safe position when the first selector member is in the first position relative to the pivotable shaft, wherein the first selector member is configured to prevent the pivotable shaft from rotating into the firing position when the first selector member is in the second position relative to the pivotable shaft.

Abstract: A rear sight assembly for a firearm is disclosed. The rear sight assembly contain a sight base coupled with the firearm, a sight blade pivotally coupled with the sight base and a tension member positioned between the sight base and the sight blade and configured to push the sight blade against the firearm.

Abstract: An improved M1911 handgun is disclosed. The improved M1911 handgun contains a handle containing a lower end, and a magazine well formed in the handle and adapted to receive and hold a double stacked magazine, wherein the inner cross-sectional profile of the magazine well is same from the lower end of the handle to a top of a frame of the improved M1911 handgun.

Abstract: A bolt hold open mechanism assembly is disclosed. The bolt hold open mechanism assembly contains a connector rod, a follower lever associated with the connector rod, a bolt stop associated with the connector rod, and a lifter lever comprising at least one protrusion configured to interact with a magazine follower.

Abstract: A rear sight assembly is disclosed. The rear sight assembly contains a housing defining a first opening, a second opening, and a third opening, a rear sight mechanism containing a thumb wheel positioned in the first opening, at least partially threaded support member positioned in the second opening and the third opening, wherein the at least partially threaded support member is threaded through the thumb wheel, and a rear aiming point member adjustably coupled with the at least partially threaded support member.

Abstract: A fire control assembly and a method are disclosed. The fire control assembly contains a pivotable shaft containing a first end and a second end, and a first selector member removably coupled with the first end of the pivotable shaft, wherein the first selector member is movable between a first position relative to the pivotable shaft and a second position relative to the pivotable shaft, wherein the first selector member is configured to rotate the pivotable shaft from a safe position to a firing position and back to the safe position when the first selector member is in the first position relative to the pivotable shaft, wherein the first selector member is configured to prevent the pivotable shaft from rotating into the firing position when the first selector member is in the second position relative to the pivotable shaft.

Abstract: A rear sight assembly is disclosed. The rear sight assembly contains a housing defining a first opening, a second opening, and a third opening, a rear sight mechanism containing a thumb wheel positioned in the first opening, at least partially threaded support member positioned in the second opening and the third opening, wherein the at least partially threaded support member is threaded through the thumb wheel, and a rear aiming point member adjustably coupled with the at least partially threaded support member.