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Old May 20, 2013, 09:28 AM   #7
Senior Member
Join Date: May 8, 2009
Location: Florida
Posts: 3,163
Simple summary:

Single action: the trigger performs the single action of releasing the hammer or striker.

Double action: the trigger performs two actions, first cocking the hammer or striker, and then releasing it.

DA/SA: the first trigger pull is double action, cocking and releasing the hammer or striker, and then the subsequent pulls of the trigger are single action because the slide has cocked the hammer or striker.
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