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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 design utilizes a double-action/single action trigger mechanism, meaning that the first shot is fired with long double-action pull, with following shots fired in single-action. [3] The 457's external hammer omits a thumb spur, thereby reducing the risk of being caught on clothing during unholstering. [3]
The VP9 trigger has a short, light take-up with a solid, single action type break followed by a short positive reset. The average weight of the stock trigger pull is 5.2 lb f (23 N). The VP9 trigger has a consistent pre-travel pull followed by a positive set with clean break. Disassembly does not involve releasing the striker by squeezing the ...
The Beretta 950 is a simple blowback pistol with a single action trigger mechanism and tip-up barrel.The frame is made out of aluminum alloy, the slide and barrel are carbon steel.
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.
The locking system is a near-identical copy of the Model 1911's, with the swinging lock used to unlock the barrel from the slide. The pistol has a two-stage, single action trigger, but unlike that of the 1911 trigger, it pivots rather than slide. The spring housing system is integrated to the pistol frame rather than being a separate part.
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.