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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 ...
The Smith & Wesson Model 2, also referred to as the Smith & Wesson .38 Single Action, was a .38 caliber revolver produced in both single and double action by Smith & Wesson. The manufacturer's first of that caliber, its 5-shot cyclinder was chambered in .38 S&W. The single-action was produced in three varieties from 1876 through 1911, with ...
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]
In 1889, Colt introduced the Model 1889, the first truly modern double action revolver, which differed from earlier double action revolvers by having a "swing-out" cylinder, as opposed to a "top-break" or "side-loading" cylinder. Swing out cylinders quickly caught on, because they combined the best features of earlier designs.
The Colt Double Eagle was a double-action / single action, semi-automatic pistol manufactured by Colt's Manufacturing Company between 1989 and 1997. It was available in standard full-size, as well as in more compact versions. It featured a decocking lever, and was chambered for several calibers. The family of models was known as the Series 90.