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Trigger mechanism in a bolt action rifle: (A) trigger, (B) sear, (C) striker spring, (D) striker. Thompson submachine gun trigger. A trigger is a mechanism that actuates the function of a ranged weapon such as a firearm, airgun, crossbow, or speargun.
Trigger: A mechanism that actuates the firing sequence of a firearm. Triggers almost universally consist of levers or buttons actuated by the index finger. Trigger pull restrictor (TPR): A quasi-selector device intended for automatic firearms using a staged trigger. Trunnion: a cylindrical protrusion used as a mounting and/or pivoting point. On ...
However, if a user shooting under stress short-strokes the trigger by only releasing it halfway, the trigger will reset, but with a 38 N (8.5 lb f) pull. This temporary increased trigger pull is intended to prevent negligent discharges. Double-action – firearms trigger: Pressing the trigger 1) cocks, and 2) drops the hammer. The hammer can ...
Length of pull is an important ergonomic factor for ease of use; and optimum length of pull may vary with the size of the shooter, the thickness of chest clothing and body armor being worn, [1] and whether the shooter is firing from a standing, sitting, or prone position.
Aftermarket trigger companies, such as Bold, Timney, and Jewell, produce products in which sear contact is adjustable for personal preference. When a gunsmith does a "trigger job" to improve the quality and release of a trigger pull, most often the work includes modifying the sear, such as polishing, lapping, etc.
Examples of the variety of typical semi-auto mechanisms are a stiff double-action trigger pull with the safety off (Beretta 92F/FS), a double-action with no external safety (SIG Sauer P-series, or Kel-Tec P-32), or a crisp single-action trigger pull with a manual safety engaged (M1911, FN Five-seven and certain configurations of the HK USP).
The disadvantage of this is that the long, heavy pull cocking the hammer makes the double-action revolver much harder to shoot accurately than a single-action revolver (although cocking the hammer of a double-action reduces the length and weight of the trigger pull).
A binary trigger (or pull and release trigger) is a type of device that allows a semi-automatic firearm to fire at an increased rate. A binary trigger works by firing one shot upon pulling the trigger and then firing a subsequent shot upon release of the trigger. Binary triggers are installed through modification of the fire-control group.