During the pre-credits sequence, Felix Leiter (David Hedison), gives James Bond (Timothy Dalton) a Taurus PT92 "just in case". Bond uses it during the shootout against the henchmen that attack him, Leiter, and his fellow DEA Agents, using it moments later to shoot the Jeep's left front tire. Milton Krest (Anthony Zerbe) uses a PT92 to shoot at Bond on Krest's boat when he kills a diver and jumps off. The film's armorer states clearly its a Taurus PT92 and not a Beretta M92FS.
Colt Commando Carbine
Felix Leiter and his fellow DEA Agents during the precredits sequence, are armed with Colt Commando Carbines.
Heckler & Koch MP5A3
Many of Sanchez's henchmen are armed with H&K MP5A3 SMGs. Dario (Benicio Del Toro) carries one on the Jeep in the pre-credits sequence. The guard at Milton Krest's warehouse carries one, as do several of Sanchez's men during the final shootout.
Ingram MAC-10
During the pre-credits sequence, at least one of the henchmen in the Jeep uses a MAC-10.
M16A1
The DEA agents and soldiers that escort the prison van carrying Sanchez and the soldiers in the fictional country of Isthmus use M16A1 rifles fitted with M16A2 handguards.
Remington 870
Ed Killifer (Everett McGill), the DEA agent that Sanchez bribed to get him out of custody, carries a Remington 870 shotgun in the prison van, using it to knock the driver out and take control of the van and run it off a bridge.
Heckler & Koch P9S
One of Sanchez's hitmen sent to kill Della is armed with a Heckler & Koch P9S. The same henchman is later seen on the Wave Krest.
Walther PPK
James Bond (Timothy Dalton) carries his usual Walther PPK as his weapon of choice throughout the film. However, it is seen with a wooden grip rather than the typical plastic.
unidentified revolver #1
The security guards at Milton Krest's warehouse carry revolvers with brown grips.
When Bond hijacks the seaplane full of money, one of the pilots pulls a Smith & Wesson Model 15 on Bond and attempts to shoot him with it (instead shooting a package of money), but Bond knocks it out of the pilot's hand.
Mossberg 500 Cruiser
CIA Agent Pam Bouvier (Carey Lowell) uses a sawn-off Mossberg 500 Cruiser during the bar fight. It blows a hole in the wall somehow big enough for a human to fit through.
unidentified revolver #2
Dario (Benicio Del Toro) grabs a revolver from one of his henchmen in the bar and uses it to fire at Bond and Pam as they get away on the boat.
Beretta 21 Bobcat
Pam carries a stainless steel Beretta 21 Bobcat as her sidearm throughout the film, giving one to Bond, and grabbing a spare one out of her purse when Bond leaves to check the hotel room. She also notably uses her Bobcat when she meets Professor Joe Butcher (Wayne Newton) when she goes to "study" with him.
customized camera gun
Q makes Bond a customized camera gun to assassinate Sanchez, which can only be fired by him (explaining why the Chinese Intelligence agents cannot get it to work).
During the tanker chase, one of Sanchez's henchmen attempt to use an FIM-92A Stinger to try and kill Bond, but Bond dodges the missile by tilting his tanker on it's left side wheels, making the missile miss and hit another tanker behind him.