Its a funny thing about the Serpa. If you do hold your finger down on the release, and then slide the weapon out, the finger ends up on the slide area. Not sure how someone actually hits the trigger without moving their finger down along the trigger guard.

The portion of the mechanism which releases the gun is right over the trigger guard, so there is no way to release the weapon if your finger is putting pressure there.

I guess the issue of actually needing finger pressure is the risk.

Go figure.