Abstract: A firearm receiver assembly is disclosed herein. The firearm receiver assembly includes a receiver having at least two pillar apertures. The firearm receiver assembly also includes a chassis having a top portion, a bottom portion, and a side portion. The receiver is configured to be set within the top portion. The firearm receiver assembly also includes a bottom metal having a top side, a bottom side, a proximate end, and a distal end. More so, the firearm receiver assembly includes at least two integrated pillars extending from the top side of the bottom metal. The at least two integrated pillars are configured to align with the pillar apertures of the receiver.

Abstract: A bolt stop assembly is disclosed herein. The bolt stop assembly may include a receiver and a bolt. The receiver may include a plurality of channels extending longitudinally to a firearm barrel. The bolt may include a series of lugs on a distal end of the bolt configured to traverse the plurality of channels. The bolt stop assembly may include an aperture adjacent to the breech end of the receiver, and an actuating bolt stop set within the aperture. The actuating bolt stop actuates around a pivot pin within a pin hole set parallel to a longitudinal axis. The actuating bolt stop may include an interior surface where a biasing member is disposed between the interior surface and the receiver.

Abstract: A bolt carrier may be provided. The bolt carrier may comprise a counter-bore, a housing, a cap, and a free-floating mass. The counter-bore may be disposed in the bolt carrier. The housing may be disposed in the counter-bore. The housing may have an interior, a first end, and a second end. The cap may be disposed at the second end of the housing and may be connected to the bolt carrier. The free-floating mass may be slidably disposed in the housing. A length of the free-floating mass may be less than a length of the interior of the housing between the cap and the first end.

Abstract: A firearm stock may be provided. The firearm stock may comprise a fore-end portion and a pistol grip portion. The fore-end portion may comprise a fore-end portion cavity and a fore-end insert. The fore-end insert may comprise a fore-end insert reinforcing structure disposed in the fore-end portion cavity. The pistol grip portion may comprise a pistol grip portion cavity and a pistol grip insert. The pistol grip insert may comprise a pistol grip insert reinforcing structure disposed in the pistol grip portion cavity.

Abstract: A bolt may be provided for a bolt carrier. The bolt carrier may comprise a gas inlet, a gas expansion chamber, a bolt bore, and the bolt. The gas expansion chamber that may receive a pressurized gas from the gas inlet. The bolt may be disposed in the bolt bore in the bolt carrier. The bolt may comprise a gas ring groove, a gas ring assembly disposed in the gas ring groove, and at least one gas port. The gas ring assembly may be adjacent to the bolt bore. The at least one gas port may provide a pathway for the pressurized gas from the gas expansion chamber to a volume underneath the gas ring assembly to increase a radial sealing force between the gas ring assembly and the bolt bore.

Abstract: An assembly for coupling a device to a firearm is disclosed. The device may be a suppressor, flash hider, compensator, or the like. The assembly may include a muzzle brake, a coupling body attached to the muzzle brake, a moveable collar disposed around the coupling body, at least one moveable clamp sandwiched between the coupling body and the moveable collar, a device core attached to the coupling body, and a spring disposed between the device core and the moveable collar.

Abstract: A suppressor assembly attachable to a firearm is disclosed. The firearm may include a barrel and a muzzle end. The suppressor assembly may include a gas block positioned about the barrel, an outer tube attached to the gas block, and a baffle attached to the muzzle end. The baffle may push against the outer tube to compress the outer tube and apply tension to the barrel.

Abstract: Systems and methods for mounting a barrel to a firearm are disclosed herein. The firearm may include a barrel, an upper receiver, a hand guard assembly, a lower receiver, a pistol grip, a buttstock, and a trigger. A barrel extension may include internal threads, mounting protrusions, mounting apertures, an elongated front barrel extension portion, an elongated rear barrel extension portion, and a barrel extension mounting flange. The barrel extension may be sandwiched and secured in between the upper receiver and the hand guard assembly via clamping screws.

Abstract: A rubber panel attachable to a rail system of a firearm is disclosed herein. The rubber panel may include an elongated body comprising a first side, a second side, an upper edge, a lower edge, a first end, and a second end. The rubber panel also may include a gripping surface disposed on the first side of the elongated body. Moreover, the rubber panel may include at least one attachment protrusion disposed on the second side of the elongated body.

Abstract: An assembly for preventing gas leaks in a bolt carrier group of a firearm is disclosed. The assembly may include a bolt carrier with a gas hole, a bolt carrier gas key attachable to the bolt carrier about the gas hole, a groove disposed on the bolt carrier about the gas hole, and a seal disposed within the groove.

Abstract: A bolt carrier group of a firearm is disclosed. The bolt carrier group may include a bolt comprising a passage, an extractor comprising a hole, and an extractor pin comprising an elongated circular body positioned within the passage and the hole to pivotably attach the extractor to the bolt. The extractor pin may include a transverse tab extending from one end of the elongated circular body.

Abstract: A bolt carrier group of a firearm is disclosed. The bolt carrier group may include a bolt comprising a passage, an extractor comprising a hole, and an extractor pin comprising an elongated circular body positioned within the passage and the hole to pivotably attach the extractor to the bolt. The extractor pin may include a transverse tab extending from one end of the elongated circular body.