Who is doing Remington warranty repairs

[Old Bob]

This won't help much, but, you used to be able to find Remington replacement shotgun barrels at places like Brownells & MidwayUSA & other online retailers. Now days! Good luck! They're nowhere to be found. I hope you can get some satisfaction from Remington. If not, maybe you can find a finishing reamer for the chamber. Pacific Tool & Gauge has shotgun reamers. Or, find a good gunsmith specializing in shotguns & have him fix it.