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With a DA revolver, the hammer can be cocked first (single action), or the trigger can be pulled and it will cock and release the hammer (double action). [1] Once the gun has fired, the hammer stays in the decocked position until the hammer is re-cocked (single action), or the trigger is pulled again (double action). With a DA semi-automatic ...
The term "single action" means that the pulling of the trigger has only one effect—it releases the cocked hammer. In a "double-action" revolver, the pulling of the trigger has two effects—it caused the hammer to cock back, and then as the trigger pull is continued, it releases the hammer. The double-action mechanism in the early Kerrs was ...
The Lefaucheux Triple Action can be used in single action by cocking the hammer with the thumb, or in double action with a long pull on the trigger, or the hammer can be cocked by a pull on the trigger, then allowing one to shoot in single action.
Remington-Rider Magazine Pistol has a manually-actuated rolling block action to pull a cartridge from a tubular magazine set below the barrel and simultaneously cock the firearm. The block was rolled back into battery, loading the cartridge into the chamber, by spring pressure while the hammer remained in the cocked position.
The P9S trigger operates as a traditional double action. There is a lever on the left side of the pistol grip to both decock a cocked hammer or to manually re-cock it for a single action first shot, a feature first observed on the Sauer 38H. A further function of the decocking lever is to release the slide stop.
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The purpose of a DAO action in a semi-automatic is mostly to avoid the change in trigger pull between the first and subsequent shots that one experiences in a DA/SA pistol, while avoiding the perceived danger of carrying a cocked single-action handgun, although it also avoids having to carry a cocked and loaded pistol, or having to lower the ...
The pistol is considered safe in this state as the "double-action" pull that both cocks and fires the firearm is both longer and heavier than the "single-action" pull that simply releases the cocked hammer, and thus an inadvertent trigger pull is less likely.