It is clearly closest to DAO as the trigger draws the firing pin back prior to release. The Glock firing pin, when at rest, is not in its fully down position, but partially back, held there by the lug of the firing pin resting against the rear leg of the cruciform.I tried to include a poll. Apparently, my poll had too many possible selections. (Why would the software let me do that?)
Single Action and Double Action
Neither Single Action nor Double Action?
Anyway, here is the post sans poll:
Do you think of the Glock design as a Single Action, a Double Action or what?
I've owned Glocks for a long time but it is only within the last year that I developed a good understanding of its trigger. That is, I always thought of it as a SAO, Single Action Only, like so many semi-autos, whether hammer or striker fired, with the fire control group being cocked by the recoil action of the slide.
More recently, I learned that a Glock is not fully cocked by cycling the slide and that it is pulling the trigger that finishes cocking the weapon. Some people have opined that Glock is a DAO pistol, since every shot involves (some) cocking via the trigger.
A 1992 Glock manual says: "... the Glock pistol has an action which combines the best characteristics of the traditional double and single action pistols, creating what has become known as the 'Safe Action' system.
"Glock pistols combine the safety and simplicity of revolver-like operation with a constant double action trigger pull, ... "
This language sort of burst my "single action" bubble. Maybe the "DAO" guy was right,
What is the Safe Action? I'm curious to know what others think. What do you think?
What does Glock think its Safe Action is? SA, DA, a hybrid in a class by itself?
I'm curious too; do other striker fired pistols operate similarly, partly cocking the weapon and leaving it to the trigger pull to complete the job?
Striker fired pistols fall into three categories: (1) firing pin fully down and trigger pulls it all the way back before release; (2) firing pin partially back and trigger pulls it the rest of the way back before release; and, (3) firing pin is fully back, and pulling the trigger merely releases the firing pin to fly forward.
S&W Sigma, SW9VE, SD9 are type 1.
GLOCK is type 2.
S&W M&P, Springfield XD Series, etc., are type 3.