Geissele Super Duty Mod1 Compelte Upper 10.3in 5.56MM DDC 08-543S. This 10.3in complete upper chambered in 5.56mm features a nanoweapon-coated HUXWRX Flash Hider-QD muzzle device mounted to an 10.3in Manganese Phosphate coated CHF Chrome Lined 1-7...