.223 Rem./5.56 NATO or .300 AAC Blackout cal., GIO, pistol (.300 BO cal. only) or mid-length gas system, 16 in. CM barrel, DB15 muzzle brake, 30 shot Magpul PMAG, standard or CMC single stage trigger, enhanced trigger guard, Magpul CTR stock, 15 in. M-LOK rail, Magul K2+ pistol grip, forged A3 flat-top aluminum upper and lower receiver, Midnight Bronze or hardcoat anodized black finish with red accents, 6.9 lbs. New 2020.