Remsport MFG 9mm Commander barrel. Match grade upgrade for your current 1911 government pistol. Fully machined in the USA from stainless 416R in our facility. Barrel will fit slides with 9mm breech face. ***All parts must be installed by a competent gunsmith. Some fitting and or tuning may be required. Remsport has no responsibility or liability of the final fit and function of the firearm.***