An AMC .44 AutoMag is used by one of the robbery crew during the Adriano's jewelry heist at the beginning of the film. One of the plot points is that .44 Automag rounds are too expensive to make, so a .308 cartridge is cut down to fit the Automag. The Automag is also used by one of Charles Kane's men to take out Axel at the 385 North Club.
Desert Eagle Mark I
A Desert Eagle is pointed at Axel before the final shootout and then is held by Karla Fry (Brigitte Nielsen) as she is about to shoot Axel.
Beretta 92F
A blank-firing Beretta 92F fitted with a laser sight is seen being used by Axel and Karla at the Beverly Hills Gun Club.
Axel is unimpressed with the blank firing weapon and decides to open fire on the screens with his Browning Hi-Power.
After the shootout at the club, Det. Billy Rosewood (Judge Reinhold) decides to switch his sidearm to a Smith & Wesson Model 29 with an 8 3/8 inch barrel as a sidearm later in the film.
Billy uses a Colt Python earlier in the film at the club shootout. One of Thomopolis' men has one in the final shootout.
Colt Trooper Mk III
While at the gun club, Karla Fry (Brigitte Nielsen) is seen firing on the range what appears to be a Colt Trooper Mk III with a 6" barrel that has been fitted with a laser sight.
The Remington 870 shotgun with a pistol grip is a weapon used by Charles Kane (Dean Stockwell) as part of the robbery crew at the racetrack.
Mossberg 500 Cruiser
Charles Kane's (Dean Stockwell) Remington 870 briefly switches to a Mossberg 500 Cruiser in a continuity error. Detective Billy Rosewood decides to use two Mossberg 500 Cruisers for the final shootout.
Rifles
M16
Several of Thomopolis' men open fire on Axel and the guys with M16 rifles.
Ruger Mini-14
At the Beverly Hills Gun Club, a shooter is seen using what appears to be a Ruger Mini-14 that's been fitted with a laser sight underneath the barrel. This is a Laser Products Corporation (later Surefire) laser sight similar to ones used in The Terminator and Wanted: Dead Or Alive. This laser sight is easily distinguished by the proprietary LPC "clamp" as well as the actual sight's "bell-shaped" end.
Submachine Guns
Heckler & Koch MP5K
One of the robbery crew uses a Heckler & Koch MP5K during the jewelry heist.
Heckler & Koch HK94
One of the hitmen who try to take out Axel at the club Thomopolis's men is seen firing an Heckler & Koch HK94 out the backwindow of a car. Some of Thomopolis' men use Heckler & Koch HK94s during the final shootout. It has been modified with a ventilated barrel shroud and a vertical foregrip. It looks similar to the version used by Arnold Schwarzenegger in the film Raw Deal.
Intratec TEC-9 Mini
Karla uses what appears to be a Intratec TEC-9 Mini fitted with a barrel shroud and foregrip during the final shootout.
Axel discovers that Billy hangs a variety of handguns on his bedroom door: A Smith & Wesson Model 36 with white grips, a Colt Python with an early laser sight (note the battery pack on bottom of the grip), a Browning Hi-Power, an AMC Automag, and a Colt Python with pachmayr grips (as well as a few others that are out of view).