Trigger (firearms)
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A trigger is a mechanism that actuates the function of a ranged weapon such as a firearm, airgun, crossbow, or speargun. The word may also be used to describe a switch that initiates the operation of
Trigger mechanism in a bolt action rifle: (A) trigger, (B) sear, (C) striker spring, (D) striker.
Thompson submachine gun trigger
The double-crescent trigger on the MG 34, which enabled select fire capability without using a selector switch. Pressing the upper segment of the trigger produced semi-automatic fire, while holding the lower segment of the trigger produced fully automatic fire.
Colt Single Action Army
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The Colt Single Action Army is a single-action revolver. It was designed for the U.S. government service revolver trials of 1872 by Colt's Patent Firearms Manufacturing Company and was adopted as the
Trigger (firearms)
…the Colt 1860 "Army" Model, and Colt 1851 "Navy" Model, and European models like the LeMat, as well as early metallic cartridge revolvers such as the Colt Model 1873 "Single Action Army" (named for its trigger mechanism) and Smith & Wesson Model 3, all of which required a thumb to cock the hammer before firing. Single-action triggers…
A model with a 7+1⁄2 in. barrel
Colt Sheriff's Model, 3-inch (7.6 cm) barrel
Colt SAA formerly used by the San Antonio Police Department
Colt Single Action Army revolver (Model 1873), displayed at the Istanbul Military Museum, Istanbul, Turkey