If you want one holster (or multiple holsters) that can attach to multiple platforms, Safariland QLS is the best system out there.
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Quick Locking System (QLS) - Inside Safariland
Quick Locking System (QLS) - Inside Safariland
This 6385 OMV open top holster features the Automatic Locking System (ALS ), an internal locking device that retains the weapon in all directions with no snaps or straps to manipulate. It features the QLS 19 Locking Fork and the QLS 22 Receiver Plate attached to the holster for quick transference of gear on body. This model is optimized for use with the MOLLE vest because the placement of the 3-hole pattern. Suede lining helps protect the gun's sights and finish.
6385 ALS OMV Tactical Holster w/ Quick Release Leg Strap