- Double Action
A type of lockwork in either a revolver or auto pistol that permits the hammer to be cocked either by direct manual action or by a long pull on the trigger. The term is extensively used (somewhat erroneously) as a synonym for "trigger cocking." Thus, such phrases as "The double-action pull was very smooth" or "The Seecamp is a double-action-only auto pistol."
Single & Double Action Revolver Double Action vs Single Action