I have a mid-80's 20 g. bbl off of a model 088 shotgun. A friend had borrowed it and the screw stud had broke while he had it. After a couple of years I got it back and he had gotten it "repaired'. It looked like it had been brazed to me. Yesterday, after firing 2 shots, it did it again. Has this happened to anyone else and what can be done to fix it?? JB weld?? Was this typical of 80's quality?? Any help would be appreciated!!