Jack Thorpe, the American terrorist uses a Beretta 92SB as his sidearm. When first at the school, he shows it to the guard. When the guard goes for his gun, it switches to a little .22 auto soundsuppressed mockup. A police infiltrator uses a Beretta 92SB at the end of the film to deliver the fatal shot to Luis.
One of the terrorists uses a Norinco Type 56-1, as noted by its hooded front sight and under-folding stock. It is fitted with an AKM style muzzle break, making it similair to the gun Danny Trejo used in Heat, meaning it was a semi-auto chinese import, converted to full-auto fire for the film and fitted with the slanted muzzle by the guns importer.
The terrorist who commonly partners up with the other man with the 56-1 uses what appears to be a Poly Tech Legend AKS-47, a model most closely resembling a genuine AKS-47.
The belltower guards use an M72 LAW 66mm anti-tank launcher to blow up the police car. Thorpe tries to use one on the infiltration helicopters, but is shot to pieces by the choppers guns.
The terrorists overrunning the school are armed mainly with MP5K submachine guns. Army Infiltration members use them as well. Billy Tepper (Sean Astin) steals one from a terrorist when the Army infiltrates the school.
One of the terrorists is seen multiple times using an Uzi Carbine, the civilian version of the Uzi, fitted with a 16in barrel with a barrel shroud. It seems the armorers converted it to full-auto fire for the film. It is most obviously used when Joey Trotta (Will Wheaton) knocks out a terrorist and attempts to kill another with the the Uzi, failing as the muzzle rise, very innaccurately depicted, raises his fire to the sky, and he is gunned down by the terrorist's MP5K.
The infiltration unit has two snipers armed with unknown sniper rifles. The have heavy muzzle breaks and fluted barrels, but not much more is made evident.
One of the roof guards is still partially alive after being shot by the snipers, and throws an M67 "Baseball" grenade down at the infiltration unit and kills all but the leader, who is wounded in the leg.]]
