wheelgun

A revolver is a repeating handgun that has a revolving cylinder containing multiple chambers and at least one barrel for firing. Revolvers might be regarded as a subset of pistols, or as an equal-ranking subset of handguns, distinct from pistols, which in this case are defined as handguns with a single chamber.
The revolver allows the user to fire multiple rounds without reloading after every shot, unlike older rifles and single shot firearms. After a round is fired the hammer is either cocked by the shooter manually or by rearward movement of the trigger to turn the next chamber in line with the barrel.
Revolvers still remain popular as back-up and off-duty handguns among American law enforcement officers and security guards and are still common in the American private sector as defensive and sporting/hunting firearms. Famous police and military revolvers include the Webley, the Colt Single Action Army, the Colt Police Special, the Smith & Wesson Model 36, the Smith & Wesson Model 10, the Smith & Wesson 1917, the Smith & Wesson Model 3, and the Nagant M1895.
Though the term "revolver" usually only refers to handguns, other firearms may also have a revolving cylinder. These include some models of grenade launchers, shotguns, and rifles. These are different from other firearms with revolving chambers, such as miniguns and gatling guns in that revolvers typically require the hammer to be re-cocked with each shot and require manual reloading, while miniguns are semi-automatic or automatic and often belt-fed.

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