A bayonet lug is a metal fitting on the barrel or muzzle of a firearm that provides a mounting point for a bayonet.

A bolt action is a type of firearm action that requires the user to manually cycle the bolt to load and eject cartridges. It is uncommon in pistols.

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.

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.