"Spots" in the bore? Guess I'd have to see them myself before I could give any advice. Were they there when you cleaned the bore prior to initial firing? Have you cleaned the gun after each use?

Do they seem to cause any problems with loading, like do they cause the bullet/sabot to hang up? Do they feel like a rough spot? As others have said, solvents will remove anything on the surface of the metal. Not sure they'll help with anything in the metal.

If they are just a cosmetic issue I would not worry about them. If they do seem to be something that grab the sabot or bullet, or perhaps even something in the steel that should not be there, I would send it back. I would also talk to T/C before sending.

BUT, don't be shocked if it takes a few weeks to get a new barrel for freeif you should send the barrel back during the holidays when a company is running skeleton shifts due to vacations. Boy wouldn't that just suck something awful!?!