A firearm feed system where ammunition is stored in a separate container (magazine) that can be removed and replaced, enabling rapid reloading.

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

Firearm mechanism where a sliding fore-end (foregrip) is moved back and forth to eject spent casings and chamber a new round.

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