I just picked up my new M9-A1. Paid about 410 OTD. Seems really nice, and I'm pretty excited about firing it. I've been hanging out here for a while, and finally can relate! I really like the book they send with the case. It's the nicest manual I've ever seen! While looking through it, I see that there is an optional buttstock similar to Glock's. Where can I get one?