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CMMG 54A8879-AB: Compact and capable, 5.7x28mm was designed to be right at home in AR15-pattern firearms like the CMMG Mk4 platform. Standard features include Radial Delayed Blowback Operating System; air craft grade aluminum receivers; Zeroed pistol grip, drop-in trigger, polymer dust cover, ambi-charging handle; M-LOK free float handguard and Cerakote finish.
