Well, technically it’s a Colt 1991A1 question. How much difference is there between a ramped barrel and a “normal” barrel? Specifically, is there much work beyond grinding off some metal at the breech to turn a ramped barrel like this into an unramped barrel like this. Just by eyeballing it, it looks like grinding away the ramp (carefully, of course, and without overheating it, etc) should be all that is necessary. Is there anything else that needs to be done, or some other difference that makes them non-interchangeable? I’m not a serious 1911 geek, but I’m sure there are some out there that would know. The difference in availability is the reason I’m asking. The description says some minor fitting may be needed in any case, and I assume that’s generally emery-cloth minor grinding to slim it a thousandth or two in one spot or another to make for a proper fit instead of being overly tight, but is there more involved?