I recently bought an old Fox Sterlingworth that has a problem or two. First, the stock has been cut, and is loose on the receiver. Any advice on sources for a stock that won't cost me a mint? Second, and more serious, when you pull the rear trigger, both barrels fire. I haven't had time to open her up and look yet, but thought somebody out there has probably had this problem before, and knows the cause. Just in case, does anybody know of a source for parts for these guns?