Thanks for the suggestions. When I got into it, I discovered that the material used was not silver solder but was more likely a flux coated bronze brazing rod. I needed oxyacetylene and some prying to get the rib removed. No way I want to spend the time and effort getting the rest of this bronze off the rib and barrel, plus I wouldn't feel comfortable shooting it after all of the heat this barrel has seen. So a ruinous attempt at a simple repair has, unfortunatley, relegated this old Nitro Special to the parts bin. :-(
