So what firearms did we see in the film?  There were a bunch.

Just off the top of my head:

Joker had a Glock 18, seriously cut-down Rem 870 (that he took off the bank robber hit by the bus), a sub-gun that I believe was either a Swedish K or a SW 76.  Oh, and a RPG.

Harvey Dent had a Smith snubby while he was still One-Face.  After he became Two Face I think he had a 3" Smith 65.  

Someone in the Joker's gang held a Beretta 92 Inox to the head of one of the black gangsters.  

Most of the cops had Glocks, and I saw a lot of M16A2's with the cops, too.  

In Hong Kong, most of the Chinese gangsters seemed to have HK pistols (P30's?).  

What else did anyone notice?

I never did figure out what Gordon's pistol was; he carried a Glock in Batman Begins, but it looked like a SIG or maybe a Smith auto in this one.

Oh yeah, and the gangster in the courtroom had a "Chinese carbon fiber pistol, 28 caliber".  Even though it was obviously a Glock 26.  

Not sure about M16A2's, but plenty of M4style/patrolman's carbine's.

Dupish thread, same subject still one page one