Name of the jokers gun in the dark knight?

Question

What is the name of the gun the joker uses in the beginning of the movie at the bank robbery?........the one he shoots the bank manager with.

http://video.google.com/videoplay?docid=517627912214958199&ei=vhe3SOnGAYvA-wHctcCkDQ&q=the+dark+knight+first+6+minutes&hl=en

Answer 1

Looks like a couple of possibilities:

Pernach OTS-33

http://www.dreadgazebo.com/gunporn/?cat=...

Glock 18C

http://www.longmountain.com/movieguns/Te...

or, more likely, a "movie-only" fabricated prop gun.