Single-chambered firearm that can be held with
one hand. Each pull of a semi-automatic pistol fires a complete cycle, ejecting
the shell casing and reloading another round from the magazine. The trigger must
be released and pulled with each cycle.
Firearm with a multi-chambered cylinder that rotates
around an axis when the hammer is cocked A revolver fires one round for each pull
of the trigger.
firearm with a smooth bore that discharges shells containing numerous pellets
or a single slug .Semiautomatic shotgun allows for a complete firing cycle with
one pull of the trigger