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It is also known as traditional double-action (TDA), as the vast majority of modern "double-action" handguns (both revolvers and semi-automatic pistols) use this type of trigger instead of "double-action only" (DAO). In simple terms, "double-action" refers to a trigger mechanism that both cocks the hammer and then releases the sear, thus ...
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]
Most traditional semi-automatic double-action/single action (DA/SA) pistols are designed to be carried with the hammer down (uncocked) on a chambered round, with or without a manual safety engaged. 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 ...
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.
Falling block action (also known as a sliding-block action): A single-shot firearm action in which a solid metal breechblock slides vertically in grooves cut into the breech of the rifle and actuated by a lever. In the top position, it locks and resists recoil while sealing the chamber. In the lower position, it leaves the chamber open so the ...
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]
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The trigger comes from the factory with a 24 newtons (5.5 lbf) single-action pull, and is capable of both single-action and double-action. Pulling back the slide sets the hammer backwards and downwards to its single-action position, making for a very short trigger pull, with minimal take-up. The double-action pull is longer and more stiff.