JB weld?
That would be great. lol.......
I do know a guy who left his muzzleloader outside and the bore rusted up very badly for the last 6-8 inches. He figured .50cal was close to 1/2 inch, so he took a 1/2" drill bit and reamed out all the orange gunk. No more rust, but no more rifling. He said it would miss a sheet of plywood from a stone's throw away.
