Mapper, while I'm thinking about it. File this in the FWIW category . . .
I'm pretty close to certain that at least the Colt (factory) 9mm 1911s have a narrower feed ramp cut at just slightly a different angle. Just enough to make them unreliable without some work, if you convert one down the road to .45ACP.
Obviously this is not an issue using a 9mm frame as a .22LR host . . . . but if you didn't already know about the feed ramp cut being different, I wanted to give you a heads up.

Originally Posted by
mapper
Yeah, yeah I know, 9 mm and 1911 should not be in the same sentence, but hear me out on this one...
I picked up a rock island 1911 a1 in 9 mm, for a couple reasons. I needed a frame for the 22 Conversion.