|AR-15 chambered in 5.56x45mm NATO and accepts .223 Remington. Direct impingement mid-length gas system; .750 diameter gas block. Upper receiver: aircraft grade 7075-T6 aluminum flat top with forward assist and M4 feed ramps, Type III hard coat anodized finish. Lower receiver: aircraft grade 7075-T6 aluminum Accu-Tite Tension System with Type III hard coat anodized finish. Sixteen inch chrome-moly vanadium barrel with 1:8 inch right hand twist rate and melonite finish. Springfield Armory proprietary enhanced GI trigger with nickel boron coating. Low profile flip-up sight, dual aperture rear sight, 1/2 MOA windage adjustable; Flip-up, 1/2 MOA adjustable front sight. Bravo Company trigger guard and Mod 3 pistol grip. M-Lok aluminum SA proprietary patent-pending free floating handguard with locking tabs. Bravo six-position adjustable buttstock. GI style charging handle. Carbine H heavy tungsten buffer system. Mil-spec dimension carbine receiver extension manufactured from 7075 T6 aluminum with Type III hard anodized finish. M16 bolt carrier group with Carpenter 158 steel bolt, shot peened and magnetic particle inspected. Includes one Magpul PMAG Gen M3 magazine. Length: 35.5 inches fully extended; 32.25 inches collapsed.