The Agency Arms 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, and a polished feed ramp. The Agency Arms Barrel is an excellent upgrade from a traditional Glock barrel and offers a tactical appearance for optimal satisfaction. Features416R Stainless SteelPolished Feed RampBeveled and Polished CrownThread Protector DISCLAIMER: This product is not manufactured, authorized, endorsed, or warranted by GLOCK. GLOCK does not warrant or represent that this product is compatible with GLOCK pistols.