This .223 Wylde chambered 16 inch barrel is machined from 416R Stainless Steel with a QPQ finish. The Premium Black Series Barrels feature a Nickel Boron Coated Extended M4 Feed Ramp Extension. Hanson Series Barrels feature the proprietary BA Hanson profile and include a pinned lo-pro gas block. Features : QPQ Corrosion Resistant Finish Hanson Barrel Profile 1/2x28 Threaded Mid-length gas HP and MPI Tested Includes low profile gas block