Yes, vamp is right. Leapers only dishes out replacement parts to those still under the warranty. However, if you are able to talk your way into some spare parts, that would be the next best option. If you plan on using the rifle stock, and find yourself having a "good" chat with leapers, get some other parts for your rifle too. Like Vamp said, buckings, buckings, buckings. If your stock one rips, having one at the ready would be very nice.
Like Vamp and I said, Leapers does not tend to just give out parts if you are not still under the warranty. However, alittle sweet talking your way into some parts, is worth a try.