All 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 14.5" 1:7" CMV CHF Carbine-Length M4 Barrel Assembly 07-075-18024-018