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A single-action (SA) trigger is the earliest and mechanically simplest of trigger types. It is called "single-action" because it performs the single function of releasing the hammer/striker (and nothing else), while the hammer/striker must be cocked by separate means. [1]
Single-action: Usually referring to a pistol or revolver, single-action is when the hammer is pulled back manually by the shooter (cocking it), after which the trigger is operated to fire the shot. See also double-action. Single-shot: A firearm that holds only a single round of ammunition and must be reloaded after each shot.
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. The short action rifle usually can accommodate a cartridge length of 2.8 in (71 mm) or smaller. The long action rifle can accommodate a cartridge of 3.34 in (85 mm), and the magnum action rifle can ...
Sear shown in a revolver action Sear (B), in a rifle. In a firearm, the sear is the part of the trigger mechanism that holds the hammer, striker, or bolt back until the correct amount of pressure has been applied to the trigger, at which point the hammer, striker, or bolt is released to discharge the weapon. The sear may be a separate part or ...
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]
Many original single-action revolvers have a half-cock "safety" notch on the hammer, but these are not drop-proof. [22] Modern single-action revolvers, those made after the early 1970s, almost always have an internal safety, such as a hammer block or transfer bar. It is safe to carry such firearms with a loaded chamber under the hammer.
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It is basically an internal trigger actuated by the bolt/bolt carrier when placed in-battery. An auto sear is required in nearly every automatic rifle . An auto sear allows a semi-automatic gun to be converted into one capable of automatic firing with a single, continuous pull of the trigger.