I'd still like to see a 3D replica of a Calico M-950 machine pistol (a.k.a. the Liberty III). To the best of my knowledge, it isn't manufactured any more, but its unique appearance and cylindrical magazines made it quite the popular weapon for sci-fi films and futuristic TV shows.

Sample pics:

http://mem.tcon.net/users/5010/5491/m-950.htm