Just repurchased my first ever shotgun back from the man I sold it to 25 years ago. Amazing to have it back! Found some pitting and a groove in the barrel. Appears to be about 3 inches long near the beginning of the barrel. Can barrel insides be "fixed" like this? Wondering about finding a replacement barrel. It has the "polychoke" or adjustable choke on it, but the replacement doesn't need to have it. Any ideas or leads on that? Thanks!