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. The Agency Arms Barrel for your Glock is an excellent upgrade from a traditional Glock barrel and offers a tactical appearance for optimal satisfaction. Features416R Stainless SteelPolished Feed RampBeveled and Polished CrownCompatible with Gen 1-4 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.