Trigger disconnector

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A trigger disconnector is a type of safety in a firearm, which prevents the trigger from being held down after a shot has been fired. This disallows either automatic fire or deliberate "slam fire", depending upon the particular firearm's action. Notable firearms that lack this feature include machine guns, the Winchester Model 1897, the Winchester Model 12, and Ithaca 37 shotguns.

http://en.wikipedia.org/wiki/Winchester_Model_1897