Welcome to GBO!! I just repositioned a forend stud on a barrel cuz it wasn't on straight. I used a dremel sanding drum to rough the metal up on the barrel and the stud, then used epoxy to fasten it back on. The factory resistance welds it on which isn't very stout. I think epoxy like JB Weld or Super Weld would work at least as good if not better than the factory "weld". So far mine is holding fine, I figured if tightening the screw didn't pop it off, it would hold. You could also silver solder it on, the old H&R silver soldered the underlugs on the barrels!!
Tim