You can fix the crack. It most likely was cracked by recoil when firing grenade-launching blanks during training. Take the action out of the stock and remove the recoil plate. Take some Super Glue, the thin, watery kind, and slowly 'wick' it into the crack from the starting point under/behind the recoil plate. It will fill, then empty as the glue soaks into the wood. Continue to dope it every 15 minutes or so until it refuses any more glue. The next morning it will be solid. You can sand off any excess or use Acetone to remove it. I just fixed a crack in my Saturn VUE polymer side panel the same way, and I've repaired many stocks and pistol grips like that too.