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Michael, no, The 9mm bolt carrier group is significantly different from its 5.56223 counterpart, and will not work with a 9mm build.

Michael, This BCG will not function on a 9 mm build. All you have to do is search "AR-9 build BCG" and there are quite a few good companies making them out there.

sorry this BCG will not work with 9MM you will need a 9MM specific BCG like this PSA Gen4 9mm BCG - Nitride - 5165449845