If money is not the problem, Wilson makes a 45ACP carbine conversion kit for the 1911, and all you have to do is remove the slide from the 1911, slide on the Wilson upper, and replace the link pin...the barrel looks to be at least 15-16" long, maybe longer.....stainless steel bull barrel.........costs $340, but, probably worth it.......am thinking of buying one myself, maybe this summer.........