Personally I think the SOLGW M89 drive lock is a better solution, as it avoids the issues with the wedge mechanism mentioned by RennBaer. The Hodge Defense S-Lock is very similar, but more difficult to find.
https://sonsoflibertygw.com/product/...ock-rail-m-lok
https://www.bigtexordnance.com/produ...pine-lock-rail
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