Why do you consider it unuseable, I have a 9 gauge ML that must have spent it's life in someone's hot attic, the wood was shrunken so badly that I at first felt it was unrestorable, but after treating the wood with oil the wood expanded slightly and the stock became useable (though the metal is still slightly proud) next I checked the barrels, after running a well-oiled brake cylinder hone up and down the barrels a few times they cleaned up well enough to shoot. My first time out with the gun I shot a pheasant with it (you could almost hear the guns "ghosts" cheering).
BTW, listen to 2-piper about the gun possibly being loaded
Steve