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Pistol action

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The action of a pistol is the mechanisms that take place when the trigger is pulled.

Single actionEdit

Single action only mechanisms are for doing the single-action motion of the hammer or striker in a
REVOLVERES 1 021 web
A single action M1879 Reichsrevolver
weapon every time the trigger is pulled. For semi-automatic pistols, this action requires the hammer to be cocked for the first round, though many guns have the cocking of the hammer as part of the weapon's cycle. After the first shot, the movement of the slide cocks the hammer for the rest of the rounds in the magazine. For single action revolvers, the hammer must be manually cocked before every shot.

Double actionEdit

Double action only mechanisms perform three actions during a trigger pull:
Adams revolver
Adams Revolver, an early double action revolver
  • Cock the hammer.
  • Releasing the hammer to fire the weapon.
  • Rotating the cylinder.

This mechanism was traditionally exclusive to revolvers. However modern semi automatics are available that are true double action only pistols, such as the Walther P38 (numerous other examples exist, however some pistols pose as DAO while they are actual striker fired, which while similar, is a category of its own.)

Traditional double actionEdit

Also known as Double Action/Single Action, this combines the technical aspects of both trigger systems. This system is exclusive to semi-auto handguns; there isn't normally a mechanism on a revolver to automatically cock the hammer again when fired. In firing the weapon, the firearm automatically cocks the hammer after the weapon is fired, via cycling. This system will cock and release the hammer if it is in the down position when fired, but the gun will act as a single action after that. The Beretta 92 pistols are a good example. They also offer a decocker on some guns, including the Beretta.

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