Is everyone aware that a 1911 in .45 ACP can easily be converted to 9mm? All that's needed is a 9mm or .38 Super slide, an ejector, a barrel, and a magazine. And a .38 Super barrel and magazine if you want a triple-caliber 1911. I have a Springfield 9mm slide on my Colt, it fit fine. Might need an assortment of recoil springs also. I think one can get .40 S&W and .357 SIG barrels to work in the 1911 9mm/38 Super slide, but I have not tried that. If so, that would give you five calibers on a single 1911 frame.