Daniel Defense 07-116-05191-018 5.56mm NATO 18" 1:7" CMV CHF Mid-Length S2W Barrel AssemblyAll of Daniel Defense’s Barrels offer high performance and a long lasting construction. All barrels are cold-hammer forged and made from 4150 Chrome Moly Vanadium steel with a mil-spec heavy phosphate coating as well as a chrome lining for superior durability. In addition, Daniel Defense Barrels are offered in a massive assortment of configurations, with options available for different lengths, gas-blocks, thread pitches, and calibers. Features: Cold-hammer forged inMade from 4150 Chrome Moly Vanadium steelMil-spec heavy phosphate coatingChrome linedAvailable different lengths, gas-blocks, thread pitches, and calibers Daniel Defense 5.56mm NATO 18" 1:7" CMV CHF Mid-Length S2W Barrel Assembly 07-116-05191-018