That part of a firearm mechanism that is moved manually to cause the firearm to discharge. The following are various types of triggers: Adjustable Trigger, Crisp Trigger, Double Trigger, Double Pull Trigger, Double Set Trigger, Folding Trigger, Hair Trigger, Hinged Trigger, Inertia Trigger, Non-Selective Single Trigger, Release Trigger, Ring Trigger, Selective Single Trigger, Set Trigger, Sheath Trigger, Single-Double Trigger, Single Trigger, Single Set Trigger, Single Stage Trigger, Spur Trigger, Target Trigger, Thumb Trigger, Twin-Single Trigger.
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