Nice find. I would not worry about the barrel overly much. Most barrels will not pass the bore cam test with flying colours.
Just know that when you use it, you have to clean it and well.
I use nylon brushes to introduce the Butches Bore Shine solution in the barrel.
I let it sit for up to 15 minutes then patch that out with 2 or 3 patches, then repeat.
I find bronze bristle brushes leave copper or brass in the barrel. I do not use them, except for in shotguns & then mainly only if there is plastic fouling.
After using a copper fouling remover, I always oil the bore with Hoppe's #9 bore solvent. It is also one of the best anti-rust agents, much better in tests than Hoppe's oil.
I just use it for the oil & anti-rust content.