American Gangster

The following guns were used in the movie American Gangster

Colt 1911

Frank Lucas (Denzel Washington) with a Colt 1911.

Beretta 950 Jetfire

The Beretta Jetfire is chambered in .25 ACP, and was first manufactured in 1953 as a carry or holdout pistol.

Cobray M11 SMG

A drive-by shooting on the streets of Harlem with a Cobray M11 Submachine gun with Wire stock and barrel extension - 9mm (Note the elongated receiver).

         That's not an elongated receiver, that's a MAC-10 fullsize, but the magazine looks like 9mm

I agree, I don't think it's elongated at all. It also doesn't have the same style folding stock as the full-auto version of the M11/9. Also, an FYI: The Cobray M11 did not exist in the 1970s when the movie takes place, so if they were using one in this movie, it would be an anachronism. But like I said, that's not a Cobray M11.

Smith & Wesson 586

File:AG-Revolver.jpg

Frank Lucas (Denzel Washington) drops a revolver of unknown make and model, most likley a Smith and Wesson Model 586 .357 Magnum revolver with a four inch barrel, or possibly a Colt Python of the same caliber and barrel length.

NEF Pardner SB-1

Frank Lucas (Denzel Washington) with a breech loading single barreled shotgun, the New England Firearms SB-1.