Carter's henchman Enrique (Matt Gallini) carries a two-tone SIG-Sauer P226 in 9x19mm, which is distinctive in that it has a nickel-plated frame and a black slide (a finish that is not offered from the factory, meaning that his P226 was made by combining two different guns). Enrique's P226 later falls into the possession of O'Connor, who uses it to shoot at Carter on the yacht in the climax. This same gun is used by one of the drivers-for-hire who is competing with O'Connor and Pearce for Carter's job offer.
Roman Pearce (Tyrese Gibson) is also seen a P226 during the scene in which he and O'Connor are competing for Carter's job offer. However, his P226 is all-nickel, unlike Enrique's which is two-tone.
Heckler & Koch USP
Carter's other henchman, Roberto (Roberto Sanchez) carries a two-tone Heckler & Koch USP with a very shiny chrome-plated slide as his sidearm, which is seen when he and Enrique confront O'Connor and Pearce at the dock. O'Connor briefly takes control of the weapon and points it at Roberto's head before Carter steps in.
Heckler & Koch MP5A3
SWAT troopers led by Agent Markham (James Remar) are seen using Heckler & Koch MP5A3 submachine guns fitted with Surefire forearms and red-dot sights and navy trigger groups when they attempt to take down Carter at an airfield (unaware that they've been duped). At least one of the MP5s has a Navy trigger group with Safe-Semi-3-round burst options (but not full-auto fire).
Glock 17
The Miami police throughout the film use 2nd Generation Glock 17 pistols as their sidearms, which are seen most notably during the scene when they have O'Connor and Pearce trapped in the warehouse.
Glock 19
O'Connor carries a compact Glock variant (most likely a Glock 19 in 9mm), which has 3rd Generation styling (rail frame plus finger grooves), when he and Pearce confront Agent Markham and the other federal agents. It is only seen briefly when he pulls it from his waist and slaps it down on a table, and does not appear again for the rest of the film.
Actually I believe in the movie it was a 9mm Model 26 or .40 S&W Model 27, it had a grip too short to be a Model 19.
Beretta 92FS Inox
Agent Markham (James Remar) carries a Beretta 92FS Inox as his sidearm throughout the film. Some of the Miami PD officers can also be seen using them.
Colt CAR-15 variants
Colt CAR-15-type assault rifles appear in several scenes. When O'Connor is captured by the police in the beginning of the film, many of them appear to be using CAR-15 variants. Another is wielded by one of Carter's henchmen in the climax. It is not clear what variant they are, but they have A2-style receivers and non-M4 style barrels, so they might be the Model 723 or 725.