My problem: the Serpa holster’s release button places your finger across the slide, parallel to the slide, upon release. I’m a high register kinda guy; I want my finger as high up on the slide as humanly possible to avoid a negligent discharge. Working from the rabbi’s principle that you will perform half as well in combat as you do in training (at best), if you’re training for high register, you’re finger may go as low as parallel in the stress of combat. If you start at parallel, you may end up with a Suarez situation. Besides, why do civilians need retention holsters?