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A trigger is a mechanism that actuates the firing sequence of a firearm, crossbow, or speargun; a trigger may also start another mechanism such as a trap or a quick release. A small amount of energy applied to the trigger causes the release of much more energy.
In "double action" firearm designs, the trigger is also used to cock the firearm - and there are many designs where the trigger is used for a range of other functions. Although triggers usually consist of a lever actuated by the index finger, some such as the M2 Browning machine gun use the thumb, and others like the Springfield Armory M6 Scout use a "squeeze-bar trigger."

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