Fusion Firearms - 45 acp, Standard 5 inch Government size/length barrel, “Drop-in” Match style, with black finish, 1911 4140/4150(Rifle Barrel Grade) alloy steel PRO-Series Match barrel for Colt style Government, A-1 pistols and Clones. Will work with all 45 acp Colt style slides & breech faces. These Barrels are some of the best for accuracy and function on the market today. It will improve accuracy with any brand of 1911, dramatically. Comes complete with Fusion Matched bushing, Link and pin. Fusion, Made entirely in the USA on some of the highest grade barrel making equipment available. These are some of the best barrels on the market today. Being match grade barrels some slight fitting may be required depending on the slide/frame tolerances you are working with.