|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 GI trigger with nickel boron coating. Low profile flip-up sight, dual aperture rear sight, 1/2 MOA windage adjustable; fixed A2-style front sight. Bravo Company trigger guard, Mod 3 pistol grip and KeyMod PKMR handguard. Bravo six-position adjustable buttstock. GI style charging handle. Carbine H heavy tungsten buffer system. 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.