It can probably restored to a remarkable extent PROVIDED YOU KEEP ANYONE WITH A STEEL WIRE BRUSH AWAY FROM IT!
Honest, and even criminal, neglect is generally much easier to deal with than the results produced by Bubba with a power tool.
I have an old box lock non ejector where someone used a file card or similar to read the markings, leaving me with the problem of getting rid of scratches that look like the plan of a railway marshalling yard whilst preserving the markings.
It is hard to judge from a photograph but the pitting in the bore looks fairly superficial. At least with Sir Joseph Whitworth’s Fluid Compressed Steel you have best quality material if you can keep sufficient wall thickness.
Are they chopper lump barrels? I believe that I can detect the joining line in the photo of the bottom of the lumps.
