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Single action/Double action explained,,
montanajoe
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1911 = Single action. Gun only fires one way, from cocked hammer.
Traditional double action = Double action. Gun fires two ways, from hammer cocked or hammer down.
Double action only (DAO): SINGLE action. Gun fires only one way, from hammer down.
Glock and other semi-cocked striker fired pistols = Single action, since they too, only fire one way.
Definitions are mine, borrowed from the late Col. Jeff Cooper.