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

Firearm mechanism where a single trigger pull both cocks the hammer and releases it to fire the round.

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

Rimfire: a type of ammunition in which the primer is located in the rim of the cartridge case and is ignited by the firing pin striking the rim.