Revolver

A revolver stores rounds in chambers cut into a rotating cylinder. Each trigger pull (in double-action) or hammer cock (in single-action) rotates the cylinder so the next chambered round aligns with the barrel. Revolvers tolerate dirt and ammunition variation better than semi-autos and have no magazine to fail — but they hold fewer rounds (typically 5–8) and reload more slowly without a speedloader or moonclips. Often called a wheel gun.