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to provide a fast, secure, and enjoyable experience. by chris, from MO, United States Asked on January 11, 2022
The Battle Arms 9mm Development Enhanced Bolt Catch will be compatible with your CMMG MK9 lower as it is a drop-in upgrade to the existing MIL-SPEC bolt catch. However, I am unsure if it will be compatible with the UTG ambi bolt catch as well although it should still work.
