I'd have to give a +1 to the blackhawk drop leg. I've used mine for a couple of years in Airsoft matches, and have adjusted the holster for everything from a MK23 replica to a Beretta M92 replica and never lost guns in it through all the crawling, dashing and jumping etc. etc.
Provided, it's airsoft...but still, it's proven to be pretty reliable and useful place to store a pistol.
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