How about something like:
http://i56.photobucket.com/albums/g1...4/Guns/m4c.jpg
There's a billion similar to it out there so it's not conspicuous. It ain't a bit tacticool-looking either.
It'd be like LaRue's "God bless our troops (especially the snipers)" stickers. People not in the know would just see a patriotic bumper sticker, but those who have bought from LaRue know exactly where it came from :ph34r:
Also, if somebody uncool gets nosey and asks, we can tell em it stands for "Money 4 Children!"

