Calibers: 5.7x28mm (Conversion), 9mm (Conversion), .350 Legend, .458 SOCOM, .22 LR, .300 Blackout, .308 Win., .40 S&W, .45 ACP, 5.56x45mm, 5.7x28mm (FN), 6.5 Grendel, 7.62x39mm, 9mm (Colt), 9mm (Glock). Capacity: 30-round Magpul PMAG (5.56). Barrel: 16.1, 16.6, or 17 in. (varies by chambering), 1:7 twist, medium taper, 4140CM, SBN (5.56). Stock: CMMG M4 with 6-position receiver extension. Sights: Flat-top rail. Weight: 6.3 lbs. Overall Length: 32.5 to 35.5 in. Features: Forged 7075-T6 AL M4-type upper, AR-15-type lower, Type III hard-coat anodize finish, CMMG single-stage Mil-Spec trigger, integrated or CMMG triggerguard, Mil-Spec charging handle, A2-style pistol grip, CMMG RML15 M-LOK free-floating handguard, M4-style buttstock, salt bath nitride barrel finish, M4 Mil-Spec receiver end plate, A2 Comp, threaded 1/2-28, standard safety selector.