The gorilla brand is a polyurethane glue. It works best if the mating surfaces are slightly damp, this causes the glue to "foam" and expand.
Considering the shock and stresses that a shotgun stock goes through, I would go with something ore flexible than epoxy (araldite)
Do you want the repair to be invisible / match the current stock, or is cosmetics not an important factor ?
If you just want a fix, not necessarily something pretty, polyurethane is good. Watch the squeeze out, it is not an easy glue to work with on it has gone hard.
If you want something more cosmetic, make up a filler paste from yellow or white wood glue and sawdust. This is easy to sand, and you should be able to get a reasonable color match.
I'm assuming this is just a crack, and does not require structural strengthening with dowels etc.
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