A revolver is defined as a repeating handgun that has a revolving cylinder containing multiple chambers for ammunition and at a barrel for firing. The rounds may be fired by cocking a hammer manually for each shot or by pulling the trigger rearward repetitively to advance the revolving cylinder. These mechanics are known as single-action or double-action. Single-action revolvers can only be fired by cocking the hammer and then releasing it with the trigger. Single/double action revolvers still have an exposed hammer that can be cocked, facilitating either style of shooting, while others enclose the mechanism entirely in the body of the firearm, making them double-action only. It comes down to a matter of preference mostly, but having the single-action capability is typically favored by people who hunt or shoot competitively, as it take far less effort to drop the hammer with the trigger than having to pull the trigger through both phases of the action.
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