Wheel gun

Wheel guns, later known as revolvers, were firearms that utilized a revolving cylinder to chamber bullets. While most wheel guns used single-action mechanisms (meaning the hammer had to be cocked in between every shot), later models were double-action (the hammer automatically cocked after a round was fired). Most revolvers used gunpowder as a propellant, though some slugthrower revolvers did exist. Not all revolvers were handguns, as some rifles with revolving cylinders were used throughout history.