CMMG AR-9 Bolt Catch for 9mm AR Rifles
Manufactured by CMMG
CMMG AR-9 Bolt Catch for 9mm AR Rifles. This bolt catch works with the CMMG Mk9 dedicated 9mm lower and features an elongated magazine tine to work with that lower's smaller mag well. It is not guaranteed to work with any other dedicated 9mm lower or magazine block setup.