Well .. Well Well ..
Unfortunately .. or .. fortunately, depending on one's outlook. I were onna road for a few days. Shooting at an outa state CAS match. I don't take my Lap Top onna road wid me and I don't use my ubiquitous iPhone to surf the web. I take the opportunity of an "away" match to thoroughly relax. Ignore the "real" world. Play "Gunz." Bust some caps, burn some powder. Insult my usta B friends and make new friends. That sort of thing. SO: What does all of this have to do with the OP?? You might ask?? NOTHING. Absolutely .... nothing. It (the foregoing) may be completely ignored. Has nothing to do with the original sad tale of woe. Except. Couldn't contribute kernels of knowledge 'cause I didn't have my Kunkulator wid me.
Kernel of Knowledge time >>>> Both Pietta and Uberti show a propensity for glueing Remington barrels to Frames. Luckily, said glue is of the "Red LocTite kind that will release with heat. First, clamp up either the frame or the barrel in padded vise. I suggest .... one or the other (grinning alot). Apply heat to the join of barrel and frame. Load the part that hangs free as you apply the heat. When the glue releases, unscrew like crazy.
Now, if you know your going to be the maneiack .. er .. mechanic who works on the gun next, I suggest a slightly less solid glue as your adhesive of choice. If, on the other hand, you know your never going to see it again, while grinning maniacally .... slather a goodly amount of RED LocTite on and twist it home. The next poor sot to work in it will call you some really interesting things ................
I personally don't like Remingtons. Original or reproduction. Just don't like Remingtons.