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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.
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 preinstalled trigger of a particular firearm is replaced by the forced reset trigger's assembly. Typically, only one shot is fired per single function of the trigger. However, in the U.S., the ATF considers some forced reset triggers to be machineguns under the National Firearms Act . [ 1 ]
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.
A significant aftermarket of spare and replacement parts has developed around the Tavor rifle family, including the development of match grade accurizing triggers for the bullpup rifle that are produced by manufacturers such as Geissele Automatics and double stage trigger pack TAV-D from Shooting Sight.
M734 fuze cross section Amplifier (top) and oscillator. The M734 multi-option fuze [1] is a rangefinder and collision detection system used on 60 mm, 81 mm, and 120 mm mortar shells as a trigger to detonate the shells at the most damaging heights of burst when combating four types of battlefield threats:
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The KAC's lower receiver, holding the magazine and trigger assembly, is essentially a shortened M16 rifle lower receiver, which makes the basic operating controls familiar to many potential users. [citation needed] However, the cartridge, upper receiver, and operating mechanism are all new designs by KAC. [2]