MK1, Mod 1 Rifle, 14.5" Barrel, 12" KeyMod Rail, .223 Wylde, Black, Pinned FSC556 CALIBER .223 Wylde,,WEIGHT 6 lbs, 8 oz (2.96 kg), OVERALL LENGTH 31.4 (79.7 cm), BARREL LENGTH, 14.5 (36.8 cm), MUZZLE VELOCITY 2915 ft/sec (ss109), MUZZLE ENERGY 1170 ft/lbs, Features PWS Forged Mil-Spec Upper and Lower Receiver, PWS Isonite Treated 1:8 Twist Barrel, PWS Enhanced Bolt Carrier Group, PWS Key Mod Rail System, BCMGUNFIGHTER Charging Handle, Magpul MOE Stock and Grip, Magpul MBUS Gen 2 Sights, Magpul MOE Trigger Guard Magpul 30 round PMAG.