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Double-action – firearms trigger: Pressing the trigger 1) cocks, and 2) drops the hammer. The hammer can also be cocked to fire in single-action (SA) mode. 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]
Actions can be categorized in several ways, including single action versus double action, break action versus lever-action, pump-action, bolt-action, among many other types. The term action can also include short, long, and magnum if it is in reference to the length of the rifle's receiver and the length of the bolt.
Most double-action revolvers may be fired in two ways: [25] The first way is single-action; that is, exactly the same as a single-action revolver; the hammer is cocked with the thumb, which indexes the cylinder, and when the trigger is pulled, the hammer is released and the round is fired.
Almost all revolvers that are not specified as single-action models are capable of firing in both double- and single-action mode, for example, the Smith & Wesson Model 27, S&W Model 60, the Colt Police Positive, Colt Python, etc. Early double-action revolvers included the Beaumont–Adams and Tranter black-powder muzzleloaders. There are some ...
This same pistol, without modification, can be carried in double-action mode, with or without the manual safety engaged, and with the benefit of a decocking lever. Variants 3 and 4 (double action/single action, decocking lever, but no safety)
The 3rd series added single/double-action triggers on several models in lieu of the double-action only of the first two series. Additionally, the grips of 3rd generation pistols are available in various different colors and the grip stippling is altered; tactical or Picatinny rail accessory mounts are also an option. [8] [self-published source]
The Enfield-designed pistol was quickly accepted under the designation "Revolver, No 2 Mk I" (single/double action, with a hammer spur), and was adopted in 1931, [10] followed in 1938 by the Mk I* (lightened trigger pull, spurless hammer, double-action only), [11] and finally the Mk I** (simplified for wartime production) in 1942. [12]
When decocked from Single-Action mode, the trigger will reset to the full length of its pull. The pistol is now in Double-Action mode with a pull 7.9 pounds for the full length of the .55 inch pull. After firing the first shot in Double-Action, the pistol will be fired in Single-Action for all subsequent shots.