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Sear shown in a revolver action. 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 trigger pull can be divided into three mechanical stages: Takeup or pretravel: The movement of the trigger before the sear moves. Break: The movement of the trigger during the sear's movement up to the point of release, where the felt resistance suddenly decreases. Overtravel: The movement of the trigger after the sear has already released
A Crosman air pistol trigger mechanism, unmodified (top) and with a sear engagement adjustment (bottom). An adjustable trigger may have ways to adjust all of these stages, plus trigger location. For example, a first stage or takeup adjustment might include weight and travel, a second stage or sear engagement adjustment might include weight and ...
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 ...
Gunblast's SR40 example was rated with a trigger pull of 29.5 N (6.6 lb f). The difference in trigger-pull is most likely due to variances between individual guns, and not to a change in specs by Ruger between the models. [9] [7] [10] The trigger travel is 7.8 mm (0.31 in). The SR9 is recoil operated with a locked breech.
A trigger disconnector captures the hammer in the cocked position after a shot has been fired, even if the trigger is held to the rear as the gun cycles. This ensures the gun can only fire in the semi-automatic mode, as the trigger needs to be released to 'reset' and have the disconnector release the hammer back to the trigger sear.
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The Ruger 10/22 is a series of semi-automatic rifles produced by American firearm manufacturer Sturm, Ruger & Co., chambered for the .22 Long Rifle rimfire cartridge.It uses a patented 10-round rotary magazine, though higher capacity box magazines are also available.