Degrease the area, dye (Brownell’s product, comes in black or brown) some 2-part epoxy and scrape a very thin layer over it. If you blue it or brown it, it may blend in, maybe get close. Nothing wrong with leaving either.Picked this Harper's Ferry up for a good price. I'm refinishing the wood, but uncertain as to how to clean the barrel up. I've tried polishing it out, without success.
I have an idea of how to...fill it over...but I'd love to hear recommendations from the forum.