Jill St. Claire (Amanda Peet) chooses a Walther PPK from Jimmy's collection as her weapon of choice in the film. Due to her lack of clothing during the scene she is seen mainly using it, the shots had to be censored to follow the rules and regulations of the site. Quoted from the film as Jimmy and her discuss the gun:
Jill: You don't like the Walther?
Jimmy: I think you should go with what you're comfortable with.
Franklin "Frankie Figgs" Figueroa (Michael Clark Duncan) uses a nickel plated Desert Eagle (which looks like a flashpaper prop) as his weapon of choice in the film, although he never fires it.
Two Smith & Wesson 5904 pistols are seen on Jimmy's table when he has all his weapons sprawled out and Special Agent Steve Hanson (Harland Williams) keeps one as his issued sidearm.
Error creating thumbnail: File missingLate Model Smith & Wesson 5904 - 9mm. The early model 5904 pistols had the finger step trigger guard, but S&W changed it to the rounded trigger guard for 'ease of production'.Error creating thumbnail: File missingA 5904 frame is seen bottom left and another to the right. Since the magazine well looks too small, this appears to be an airsoft replica. To the left of that airsoft is Jimmy's Ruger P89 frame, to the right of it is a Jericho 941 "Baby Eagle" frame and above that is a Steyr GB pistol.
Janni Gogolak (Kevin Pollak) uses a SIG-Sauer P228 fitted with a sound suppressor when he goes to kill Jimmy in his house. Later, Sergeant Buchanan (Sean Devine) is see drawing his P228 when he enters Jimmy's house after the shootout.
Janni transports several guns hidden under his luggage to Montreal when he leaves Chicago in search of Jimmy. While airport security would likely have found this amount of weaponry hidden, movie logic contradicts this.
-That 1911 appears to be a Colt Delta Elite, you can make out the red Delta symbol on the grip. RedJedRevoler
M1911A1
Janni is briefly seen holding an M1911A1 when in Jimmy's house, for some reason replacing his SIG P228 in that scene. It appears to be the same M1911A1 seen in the briefcase.
An M1911A1 can also be seen sitting in a mail box in the DVD menu.