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Finally, there ain't nothing DA about the Glock action. You have to cock it before it will fire, and the trigger press does one thing, and one thing only: it releases the striker.

Actually, pulling the trigger does more than release the striker. Your striker is pre-tensioned, not fully cocked. Here is what I found on-line:

Safe-Action Trigger System The topic of endless debate, ridicule, and confusion, the Glock Safe-Action system is neither single-action (SA) nor double-action (DA).

The Glock, unlike most centerfire handguns, does not have a hammer which is dropped to push a firing pin when the trigger is pulled. Instead, the Glock has a striker which is completely enclosed within the slide. Whenever a round is in the chamber, the striker is partially retracted under tension. There isn't enough tension to fire the gun if for some reason the striker were forced forward from this position.

When the shooter pulls the trigger, the striker is retracted the rest of the way to full tension, wherefrom it can fire the gun. Because the trigger action needs only retract the striker part way, the trigger stroke is shorter and lighter than traditional DA designs.

From http://www.f-r-i.com/glock/misc/overview.htm