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