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Caliber 223 Remington/5.56 NATO Barrel Length 10.3" see *******Daniel Defense manufactures the highest quality complete AR15 upper receivers on the market today. The M4 URG, MK18 comes complete with a bolt carrier group, charging handle, 10.3 inch Cold Hammer Forged Barrel, RIS II MK18 Rail System that is finished in Flat Dark Earth, and a Daniel Defense low profile gas block. Type Complete Gas Impingement Series Upper FDE Sights None, Optic Ready ******Caliber 223 Remington/5.56 NATO Barrel Length 10.3" Barrel Material Chrome Moly Steel Barrel Description Cold Hammer Forged Receiver Description 7075-T6 Aluminum

John, this upper has a 10.3" Chrome Moly Vanadium Steel Cold Hammer Forged Barrel with Government Profile, Mil-Spec Heavy Phosphate Coating & 1:7" twist rate. It is Chambered in 5.56 NATO.