Jimmy "The Tulip" Tudesky (Bruce Willis) uses a Ruger P89 as his weapon of choice in the film.
Walther PPK
Jill St. Claire (Amanda Peet) chooses a Walther PPK from Jimmy's collection as her weapon of choice in the film. Do to her lack of clothing during the scene she is seen mainly using it, the shots had to be censored to follow the rule and regualtions 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.
Jill: It's what James Bond uses.
Jimmy: Really?
Jill: Yeah.
Really, I wish I could afford to replace guns left and right. Humanzie3
Desert Eagle
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.
Smith & Wesson 5904
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.
no above the jericho is a steyr GB-Doomsayer64
SIG-Sauer P228
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.
Glock 17
One of Janni's thugs is armed with a Glock 17 fitted with an extended barrel to thread a suppressor.
Makarov PM
One of Janni's thugs is armed with a Makarov PM fitted with a sound suppressor.
Heckler & Koch MP5A3
A guard outside Janni's mansion is seen restraining a dog on a leash while holding a Heckler & Koch MP5A3. The distance makes confirmation difficult.
I could have sworn I remembered seeing a close-up of the dog where it was possible to see the barrel of the MP5 more clearly in the background.
Questionable Luggage
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 logical 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.
Molotov Cocktail
After killing Janni and Special Agent Hanson, they switch Hanson's dental records with Jimmy's and burn them in Oz's car with a Molotov Cocktail made from a beer bottle.