If you want one holster (or multiple holsters) that can attach to multiple platforms, Safariland QLS is the best system out there.
Quick Locking System (QLS) - Inside Safariland
The QUICK-KIT includes the QLS 19 Locking Fork and QLS 22 or QLS 22L (Extra Locking Feature) Receiver Plate components. Constructed of injection molded nylon the receiver plate can be attached at different angles according to user preference. The QLS (Quick Locking System) allows for quick transfer of gear between attachment points such as a belt loop tactical leg shroud or other stable platform. The QLS fork and plate combination passes the Level I Retention pull test.
Safariland QLS Quick Locking System Kit Black
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Quick Locking System (QLS) - Inside Safariland
Quick Locking System Kit
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Quick Locking System (QLS) - Inside Safariland