Firearm parts, namely, buffer detent pins and springs, pivot pin detents and springs, safety detents and springs, ambidextrous dual loop end plates, buffer tube springs, buffer tube castle nuts, modular lock rail sections, takedown pin sets, bolt catch release levers, quick disconnect end plates, military standard end plates, ambidextrous safety selectors, safety selectors, anti-walk pins, dust covers with springs and rods, magazine catch assemblies, barrel nut shims, charging handles, rifle upper receivers, carbine length gas tubes and pins, gun barrels, end plates, and gas blocks; Firearm attachments, namely, modular external rail systems for firearms, mounts for attaching accessories or ancillary equipment to a firearm, mounts for attaching grips to a firearm, mounts for attaching gun sights to a firearm, mounts for attaching laser pointing devices to a firearm, mounts for attaching lights to a firearm, and mounts for attaching telescopic sights to a firearm; Firearm hand guards; Pistol grips; Rifle forearms; Rifle fore ends; Rifle hand grips; Rifle hand guards; Rifle mounts; Rifle rails; Rifle rings; Rifle scope rings; Rifles and parts thereof; Bipods for firearms; Firearm tactical rails; Foresights for firearms; Monopods for firearms; Non-telescopic gun sights for firearms; Sighting mirrors for rifles; Sighting mirrors for guns and rifles; Sights, other than telescopic sights, for firearms; Trigger guards for rifles; Trigger guards for guns and rifles; Tripods and stands for firearms