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.
Double action
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Double action refers to one of two systems in firearms where the trigger both cocks and releases the hammer.
Trigger (firearms)
…the trigger is designed only for the single function of disengaging the sear, which allows for a spring-tensioned hammer/striker to be released. In "double-action" firearm designs, the trigger also performs the additional function of cocking the hammer – and there are many designs where the trigger is used for a…
A M&P 1905 forth change lockwork with annotations