It's ugly stuff, but, 3M 2216 Structural Adhesive has no peer for sticking one thing to another. My brother owns a Savage Fox that had a nice, clean, complete break off of a chunk of wood near the top of the action, and it has held for more than a decade. The only thing he shoots with that gun are 2 3/4 inch magnum Federal slugs. I also used it to glue the stock of the duckboat gun, (wood painted black, so I didn't give a rats behind about how it looked) which has clattered about in pickups, duckboat, and the hands of exited newbies to the game for just as long. No problems.
In both cases, after I clamped it, I wiped most of the evil grey colored glue that oozed out of the crack off with a single edge razor blade. After it dried, I refinished the stock. Invisible, to all but me.
You can't buy this stuff at the hardware store, or 7-eleven. The engineering data sheet that comes with it gives you info about sheer strength, flex at temperature extremes, resistance to hot salt spray, and any other tests the eggheads at 3M could come up with, which leaves most any other glue out of the running. Check with the local industrial jobber.
Best,
Ted
