On another note, I wonder if the stock is for a pinned barrel and the cross-bolt was removed to allow the threaded barrel action to fit down in all the way. If that is the case, and your SKS has the blade bayonet on it still, finding the correct stock for the rifle would be what I would do. The other option, if you want the cross-bolt in place, is to grind off about 1/8" from the rear flat side of the bolt (that is exposed inside the stock) until the action will sit down in the stock all the way.