Dan,
Why do you want to rebarrel it? A relatively new model, it couldn't have been shot that much. Are you doing a special project?
Just curious,
Ron
Over on one of the doublegun forums there's a guy selling 20 ga rifled hammer forged bbl blanks. Made by V-C, same company that manufactured them for Hastings. I picked up two of them for I think $125 Ea, maybe $150. Borescope shows they're really good internally. They do have a series of micro grooves on the tops of each land, but that might be a good thing with plastic wadded ammunition.
I've tried about 7 or 8 different slugs and I'm not getting the results I read about. My best results were with Remington Accutips. Near impossible to find currently.