Proudly made in the USA! AimSurplus Conversion barrel for Glock22 to 9mm stainless steel barrels with a TIN Finish. Instantly convert your .40SW Glock into a 9mm with this drop in barrel (No gunsmithing required). Requires a 9mm caliber magazine and ammunition. These barrels are made in the US to Aerospace standards both in machining and quality inspection. Guaranteed fitment in a gen 1-4 Glock 23.