I have a Colt Ace made in 1980. This is the only 1911 style pistol I own. However, I would like to buy a mil-spec .45. Since there are none that are currently manufactured that are "Massachusetts compliant", prices on used guns are very high. Does anyone know if it is possible to put a .45 slide on the frame of my Ace? It is my understanding that the frames are the same but I am unsure. Any help is appreciated.