A cylindrical ammunition container, typically mounted on a firearm, that holds cartridges in a spiral arrangement for feeding into the chamber.

A firearm stock that can be folded or collapsed to reduce overall length for storage or transport.

Firearm action type where expanding gas from a fired cartridge cycles the mechanism, typically via a piston or direct impingement.

Adjustable metal aiming devices on firearms, consisting of a front post and rear notch, used without magnification.

A mounting system for attaching optical sights to rifles.

A pistol barrel with external helical grooves allowing the attachment of a suppressor or other muzzle devices.