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Put another way, "x action" refers to the number of actions performed by the trigger.

If it only releases the hammer, then it only performs a single action.

If it both cocks and releases the hammer, then it performs two actions.

I'll point out that it doesn't matter if the hammer is completely at rest, partly cocked, or mostly cocked... if the trigger moves the hammer to the rear before releasing the sear, then it's a double action.

Kevin