I am in need of some advice from a professional gunsmith. I have a 12 gauge Ithaca SKB model 600 O/U shotgun, circa 1970, 28" barrels, 2 and 3/4" chambers. The bottom barrel has a bulge about 10 and 3/4 inches from the breech end. If you look inside the bottom barrel, you can see what looks like a fairly uniform ring where the bulge is located.
Specifically, I am asking if there is any possibility that the barrel(s) can be repaired. I have included a few pictures below.
Bill in GA