The Agency Arms Mid Line Barrel is made from the highest quality materials including 416R stainless steel. They feature a 1 in 10" twist and are finished in beautiful stainless steel, black DLC, or TiN(Gold). Other key features include octagonal fluting, beveled and polished crown. The Agency Arms Barrel for your Sig P320 is an excellent upgrade from a traditional Sig barrel and offers a tactical appearance for optimal satisfaction. Features416R Stainless SteelPolished Feed RampBeveled and Polished Crown