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Yes, double action only.

In a pure striker fired system such as Glock's there is no external hammer and no means to de-cock. Most of the Glocks that I have seen are single action meaning that the gun is cocked by racking the slide and the only way to de-cock is to pull the trigger.

Yes, the trigger linkage moves the striker to the fully cocked and release position making it double-action in function. Just because the striker is patially cocked (pre-cocked) by the slide doesn't make it SA and pre-set is a term that doesn't have much use among shooters. This Glock is DA.