Can anyone fix my shotgun barrel?

I have a Belgium Browning Auto-5 12ga. semi auto shotgun. A few years ago, I shot it and I didn't realize there was a piece of dirt in the muzzle. Thus, the end of the barrel blew slightly apart. I don't want to saw the damaged part off, and I don't want to buy a new barrel. I don't need it re-choked because I don't plan on shooting it ever again. I just want it restored to look normal--if that's possible. This gun means a lot to me because my deceased grandfather gave it to me. Can a machine/fabrication shop do this? Any suggestions would be appreciated.