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A '''revolver''' is a type of repeating [[firearm]] in which several chambers within a rotating cylinder line up sequentially with the barrel of the firearm.  There are two types of revolvers: '''single action revolvers''' must be manually recocked after each shot (which also rotates the next chamber to align with the barrel); '''double action revolvers''' have a mechanism which automatically cocks and rotates the cylinder when the trigger is pulled. Double action revolvers may also be manually cocked in the same manner as a single action revolver.

A '''revolver''' is a type of repeating [[firearm]] in which several chambers within a rotating cylinder line up sequentially with the barrel of the firearm.  There are three types of revolvers: '''single action revolvers''' must be manually recocked after each shot (which also rotates the next chamber to align with the barrel); '''double action revolvers''' have a mechanism which automatically cocks and rotates the cylinder when the trigger is pulled; '''automatic revolvers''' have a mechanism that uses the recoil energy to rotate the cylinder and cock the revolver for the next shot. The automatic revolver is a very uncommon type of weapon, probably best remembered today by the Webbley-Fosbury which was used to kill Sam Spade's partner in The Maltese Falcon.   Double action revolvers may also be manually cocked in the same manner as a single action revolver.