When Chelios tries to interegate Orlando, several of the gangsters in the club draw Desert Eagles. One of these Desert Eagles is an Early Mark I in .44 Magnum, the other is a flashpaper gun. Chelios later aquires one of these Desert Eagles off of Verona's brother in the back alley-way. Since he has to fire it at such close range, the gun is a flashpaper model during that scene. Later when Chelios goes to the hospital in search of epinephran, the Desert Eagle changes to the Mark I model, which he fires several shots from before leaving it in the hospital elevator.
Smith & Wesson Model 500
Used by Ricky Verona (Jose Pablo Cantillo) in the roof shootout. He draws this weapon on Chelios (Jason Statham) who knocks it out of his hand with a wine bottle. The gun hits the ground causing it to go off, shooting off four of Verona's fingers.
Beretta 92FS
Chelios snatches this pistol out of a motorcycle cop's holster. He taunts the officer with it before throwing it across the street, distracting the officer who goes to retrieve it while Chelios steals his bike. An Asassin can also be seen using one with a sound supresser on it.
Glock 18
Used by one of the Chinese gangsters in the rooftop shootout with an extended magazine.
(Note: the gangster's glock appears to have its slide locked back the whole duration of the shootout. Is this a mistake on the part of the filmakers or just some feature I don't understand.)
IMI UZI
Used by a Chinese gangster in the rooftop shootout.
Serbu Super Shorty
Used by a gangster in the rooftop shootout at the end.
FN FiveseveN
Isn't the gun that Chev uses to "assassinate" the Asian crime lord an FN FiveseveN with a laser attachment?
Possibly, but it looked more like an XD or some Glock Model to me.