"Single Action" refers to a type of firearm mechanism where the trigger performs a single action: releasing the hammer or striker to fire a round. In this system, the hammer must be manually cocked before each shot, either by pulling it back or through the cycling of the action. This design is commonly found in revolvers and some semi-automatic pistols. In contrast to "Double Action" firearms, which can fire with a single trigger pull, Single Action requires the shooter to prepare the gun for firing before each shot. This can lead to increased accuracy, as the trigger pull is often lighter and more consistent. Examples of Single Action firearms include the Colt 1911 and the Colt Single Action Army revolver.