<I always wanted a 45ACP revolver and I was considering buying a 45ACP Mountain Gun, but overall, I'm happier that I can now shoot either. I wasn't going to cut the cylinder in my 25-5 in any case.>

How is it still possible to shoot 45Colt in this gun that you have cut the cylinder to accept clipped 45ACP? Won't you have excessive headspace for the original 45Colt cartridge? I have a 625-6 MG in 45Colt. While clipped 45ACP or 45AR brass will chamber and extract, you cannot close the cylinder with that brass. How does one machine the cylinder to fit 45ACP or AR and still get the firing pin to light off a 45Colt???.........safely, if at all!