I've got my buddies 20 ga O/U stoger and I'm thinking the firing pin is broken. You can see it sticking out in the bottom barrel. To clarify top round is fired and there is no shell in the bottom. But the pin will not allow you to open the barrels up. Is this something that can be fixed by taking the stock off? I will admit i don't have much exp at all with over unders, but i'm pretty good at most minor gunsmithing jobs. Any help would be appreciated, and bonus points if someone can help me locate parts, as it is out of warranty, thanks.