Gears is correct. Amazon carries the rails - they're between $7 and $10 or so, and ship free with prime if you have it. The longer mount is for a 9 slot rail, the shorter one is for a 7 slot. If you'd like, I can print you new ones with standard picatinny rails that don't require the MOE rails. The reason those ones are set up the way they are is because I was supplied with the rails beforehand.
Note that I don't currently have black filament and if you want them to match, you'll either have to paint them or wait for me to get black filament when I get back home for summer break in a couple weeks. I can only imagine that the grip and stock plate are painted; I've never printed anything in black except for the rail mounts, and those were on Lucian's printer the night before Apoc. Also, I can replace that stock plate for you, if you'd like. At the time, I didn't realize how low the density was on the Stratasys printer, and now that I have my own, I can make much stronger things that don't take forever to print.
EDIT: Oh hey, my PM inbox was full. Sorry about that, if you were trying to contact me before, you can do it now.
Edited by roboman, 30 April 2014 - 03:26 PM.