If you get the chance, set up with a cleaning rod and a super tight oiled jag and patch or patches so that you can confirm that the barrels still have that invisible rifling feature - that they haven't been honed or bored out.

While you're doing that, get a timing mark the rod so that you can record the rate of twist.

That tightly fit oiled patched jag will also help you indicate whether or not there is a loose spot or slight bulge anywhere in those barrels.