Daniel Defense 07-116-05042-018 5.56mm NATO 18" 1:7" CMV CHF Rifle-Length S2W Barrel AssemblyOur 18” 5.56 barrel is the most accurate and longest-lasting barrel attainable for your AR-15 build. We, Cold Hammer, Forge our barrels, a process that sets us apart from other barrel manufacturers. The 18” Strength to Weight (Daniel’s Heavy Barrel) profile barrel is forged from 4150 Chrome Moly Vanadium steel, Mil-spec heavy phosphate coated and chrome lined with rifle length gas system. Daniel Defense 5.56mm NATO 18" 1:7" CMV CHF Rifle-Length S2W Barrel Assembly 07-116-05042-018