Originally Posted by ede
Braver than I am, my fear was something would get stuck. Looking at TacSol uppers they aren't listed as fitting a 22/45, Mk III, etc. so it makes me think they do interchange. I have a top end and if any bottom end fit it opens up a lot more options for me.
To be fair to the Ruger.
My 22/45 is nearly 20 years old, and fits loose to the frame. Not loose enough to cause trouble, but loose enough to remove from the lower frame without tools.
My MKIII is fairly new. Built some time in the last few years, with a fit so tight you need to knock it off with a rubber mallet.
The 22/45 upper fit snuggly to the MKIII lower, but did not need to be knocked on. Since the mainspring housing assembly is different. I locked it all together with the MKIII MSHA.
The bolt worked smoothly and locked back on an empty magazine. It was enough to confirm in my mind you could do it, but that's as far as I went.
The uppers both look the same to my eye. I can't guarantee they would fire like that though.