Got mine today, for my M&P .45. Practice for about half an hour, then wore it out to dinner. During the practice session, I tried (with a double-checked verified unloaded gun) to have my finger end up in the trigger guard, could barely manage it on purpose. I've been drawing for 20 years with my finger alongside the frame - draw works great with the Serpa, feels natural and is FAST. My initial impressions are very positive indeed.
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NRA Certified Instructor