A rotating cylindrical chamber that holds multiple cartridges and aligns each with the barrel for firing, as used in revolver-type pistols.

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

Firearm action type where the energy from firing a cartridge cycles the action via rearward movement of the barrel or slide.

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