In the beginning of the film, Harry Tasker (Arnold Schwarzenegger) uses a Glock 19 2nd Generation pistol to shoot the guards pursuing him from the mansion. In the script the gun was classified as a Glock 21 .45 ACP but it was changed to a Glock 19 for the film, likely due to the larger magazine capacity. He was supposed to use the Glock 21 throughout the whole film but he instead uses a Ruger KP90.
Some of the men guarding the mansion at the beginning of the film are seen armed with Heckler & Koch HK91A3 rifles, as noted by their collapsing stocks.
During the bathroom scene, one of the two terrorists who follow Tasker (Arnold Schwarzenegger) attempts to kill him with a sound suppressed Makarov PM, but thanks to the camera in the fake cigarette package on the bathroom sink, he is able to see the attack coming from his glasses, and avoids the shot, and he then disarms the terrorist using it.
The Ruger KP90 is the standard issue sidearm of Tasker's (Arnold Schwarzenegger) association, being carried by him, Albert Gibson (Tom Arnold), and Faisil (Grant Heslov) in many scenes. Tasker notabley uses it when combating Salim Abu Aziz (Art Malik) in the bathroom and the proceeding chase through Cental Park and and the Marriot hotel.
Salim Abu Aziz (Art Malik) can often be seen using a Custom Shortened AKMS with two magazines taped together "jungle-style" as his primary weapon. It appears to have had the barrel professionally shortened to compact status, and clearly uses the hooded Norinco front sight, as well as other parts from both the Norinco Type 56 and the AKMS.
When Tasker (Arnold Schwarzenegger) and several other agents capture Helen (Jamie Lee Curtis) and Simon (Bill Paxton) for interrogation, they are armed with Heckler & Koch HK94A3s chopped down and converted to full-auto fire to resemble Heckler & Koch MP5A3s. They are also seen in the hands of the SWAT team members escorting the news reporters to the terrorists in the skyscraper building.
Juno Skinner's (Tia Carrere) sidearm of choice is a Beretta 92SB-C. She uses it to hold Helen Tasker (Jamie Lee Curtis) hostage in a limousine and they struggle for it, a stray shot fired during the brawl killing the driver and rendering the limousine out of control on the bridge in Florida.
One of the terrorists that captures Harry (Arnold Schwarzenegger) and Helen (Jamie Lee Curtis) has a Heckler & Koch P9S. Harry also uses one of these guns later on in the film, taking it from a guard he kills with a crowbar.
An IMI Uzi is briefly seen in the hands of a terrosist following Aziz (Art Malik) when he goes to meet Tasker (Arnold Schwarzenegger) after him and his wife are captured by the faction.
A weapon heavily used by the Crimson Jihad terrorists is the AKM assault rifle. Tasker (Arnold Schwarzenegger) commandeers several AKMs as he makes his escape from the terrorist's camp.
While fighting their way through the terrorist camp, Harry (Arnold Schwarzenegger) hands Helen (Jamie Lee Curtis) a captured MAC-10. In one of the film's more humorous scenes, Helen drops the weapon down a flight of stairs causing it to go off when it hits each step, the stray rounds scoring several kills.
At one point in the film, Tasker (Arnold Schwarzenegger) uses a Mk II hand grenade to kill several terrorists. For those wondering where this grenade came from, it was originally in the script that Juno put a grenade between Helen's legs, saying all she has to do is keep her legs closed, which Helen remarks is a problem Juno seems to have. When the two escape, he repinned it somehow for use again later. They cut this scene out of the film, causing this grenade's presence to be a continuity error. Another goof is that Tasker is shown being able to pull the pin on the grenade with his teeth, something that would be impossible in real life without suffering significant dental injury.
At the end of the firefight in the Crimson Jihad camp, Salim Abu Aziz (Art Malik) uses an M72A2 LAW to try to kill Harry Tasker (Arnold Schwarzenegger), although Harry is able to escape the blast by diving into the ocean.
When Albert Gibson (Tom Arnold) and several other agents come to the ruined terrorist camp to get Tasker (Arnold Schwarzenegger), they are seen armed with Colt AR-15 Sporter II carbines mocked up as XM177E2 Colt Commando carbines by adding a mock muzzle break.
During the highway scene when the Marine Corps Harriers are destroying the trucks the Crimson Jihad and the nukes are traveling in, one of the terrorists attempts to shoot down one of the Harriers with an FIM-92A Stinger, but luckily the pilot avoids the shot, the only casualty being another terrorist who is blown out the windshield of the truck by the backblast before being run over.
Near the end of the film when Tasker (Arnold Schwarzenegger) goes to rescue his daughter Dana (Eliza Dushku) from the terrorists in a Marine Corps Harrier, some terrorists flying by in a helicoter fire a door mounted M60 machine gun modified to use a brass catcher at the aircraft, and shatter the front of the cockpit's windshield while Tasker is trying to grab his daughter as she hangs from a construction crane. The M60 machine gun had the foreend removed and the catch bag mount installed to use the brass catcher on the M60 but retained the standard buttstock and trigger group.
Janice (Jane Morris), the receptionist at Harry Tasker's (Arnold Schwarzenegger) workplace, has a Taurus PT99 strapped to the bottom of her desk in a paddle holster, should an enemy attempt to break into the facility.
Faisil (Grant Heslov) pulls an unknown pistol out of his video camera and uses it to kill several terrorists in the sky scraper building when they opt to execute the news crew.
It looks like the Heckler & Koch P9S, Same as Harry uses. You know what movies are like for using the same prop.
It was a H&K P7
Desert Eagle
While never seen in use, a Desert Eagle of unknown model is seen in Harry Tasker's (Arnold Schwarzenegger) shoulder holster when he is being X-Rayed by his agency's security system.
When Tasker (Arnold Schwarzenegger) takes off in a Marine Corps AV-8B Harrier II jet, he uses its General Electric GAU-12/U 25mm auto cannon to great effect when demolishing the 23rd floor of the sky scraper and in an attempt to shoot down the terrorist's helicopter, which he fails to do.
