Adding a Multi-Comp compensator to your 1911 is as fast and easy as changing out the barrel bushing. Features a built-in barrel bushing, three chambers and seven exhaust ports for maximum recoil suppression. Can be used with your stock barrel. Works on all Government length (5") barrels with .576 to .580 muzzle O.D. in calibers up to and including 45 ACP. May require fitting of Wilson's Two-Piece Guide Rod (sold separately as product # 136-387) or having your stock recoil spring plug shortened to 1.2". Minor fitting required.