I recently inherited a Contender with a carbine stock, but no bolt to attach the bolt to the receiver. I called T/C and they sent me one, but it looks like the one I use for the pistol grip. The bolt is 2 3/4 inches long and is threaded about half it's length. When I attach it through the stock and into the receiver there is about an inch too much and it won't make contact. Am I missing something here, or is this the wrong bolt?