The Secret Service Agents who arrest Dade Murphy in Seattle, 1988 are armed mostly with snub-nose Smith & Wesson Model 19 revolvers, which would have been standard-issue to the Secret Service at the time.
Beretta 92F
A Beretta 92F is carried by at least one of the SWAT officers in Seattle, 1988.
SIG-Sauer P226
SIG-Sauer P226s are carried by all of the Secret Service Agents in 1995, including Agents Richard Gill (Wendell Pierce), Ray (Marc Anthony), and Bob (Michael Gaston). In real life, the smaller P228 was standard-issue to the Secret Service at the time this movie was filmed.
M16A1 with A2 handguards
The SWAT officers who arrest Dade Murphy in Seattle, 1988 are armed mostly with M16A1 assault rifles (recognizable by their thin barrel profiles and rear sights) fitted with M16A2-style hand guards. Some of these rifles also have Phantom flash hiders. Some of the SWAT officers in 1995 also use M16A1s.
M16A2
The SWAT officers throughout the movie (but mostly in 1995) are armed with M16A2 assault rifles, some of which are fitted with Phantom flash hiders.
M16 (SP1)
During the climax in Grand Central Station, one of the SWAT officers appears to be armed with an early M16 rifle fitted with M16A2 hand guards and an M16A1 flash hider.
Glock 17
A Glock 17 is carried by one of the NYPD officers who arrests Phreak, and by other NYPD officers in Grand Central Station. Also, when Dade is being taken out of Grand Central Station near the climax of the movie, it appears that the SWAT officer leading him out has a Glock 17 in his thigh holster.
Manufrance Rapid
NYPD officers and Secret Service Agents use the Manufrance Rapid (possible one of the export versions, such as La Salle Riot Gun) shotgun in several scenes.
When Phreak is arrested, one of the NYPD officers who enters his room carries an Ithaca 37 with a synthetic skeleton stock.
AMC Auto Mag
When Dade and Kate go to visit Razor (Darren Lee) and Blade (Peter Y. Kim), a robot arm points an AMC Auto Mag Pistol at them. When Blade says, "Waste the dude", the weapon "fires" a small flame from the end of its barrel. The prop itself, however, appears to be a real, blank-adapted Auto Mag pistol.