The title says it all! I shot my NFT or H&R pardner pump for the first time and I started to notice all kinds of scratches apperaring on the top of the bore! The the hell was cause this? How to fix it? THanks.
Those are definitely scratches from something rubbing against it. Either shells in the case with the gun during transportation or something hitting/rubbing the barrel when fired or a really shi**y gun rack or cabinet is doing it. Those marks shouldn't be like that from firing it alone. Is this a pump action or semi?
If you need an easy fix, clean and degrease it and paint the exposed surface with a can of Krylon. If you want it done better, there's a few people who'll Duracoat it, and then it ought to be better than factory.