1911 Barrel, 45 ACP, 5" Barrel, Fits 1911 Full Size Government, Parkerized Finish,Target crown - non threaded. 1911 .45 caliber 5 inch pistol barrels, 4150 with a Parkerized finish. These barrels are made from a solid bar of 4150 gun quality steel, heat treated and then stress relieved. These barrels have gone through extensive testing for fit, function, and accuracy testing. Made in USA.