A type of semi-automatic pistol action where the barrel remains locked for a short period after firing, delaying the blowback of gases to slow the opening of the breech.

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

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

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