The following weapons were used in the film Lethal Weapon 3:

Lethal Weapon 3 (1992)

Beretta 92FS

As in the other Lethal Weapon films, Detective Martin Riggs (Mel Gibson) carries a Beretta 92FS pistol as his standard weapon. At one point Riggs uses his Beretta to demonstrate the lethality of the armor-piercing rounds being used by the villains, penetrating a police-issue bulletproof vest with one shot. Berettas can also be seen being carried by Sergeant Lorna Cole (Rene Russo) and a young patrolman (Jason Rainwater) who is fatally wounded by the villains' armor-piercing ammo which renders the body armor he was wearing useless.

Beretta 92FS 9x19mm. This well-worn movie gun is the same Beretta 92FS that Mel Gibson used in Lethal Weapon 2, Lethal Weapon 3 and Lethal Weapon 4.

Detective Martin Riggs loads an armor-piercing round into his Beretta 92FS prior to demonstrating its lethality on a police-issue bulletproof vest. This is correct as the gun that Billy used was also a 9mm which means the same bullet would fit Riggs' gun.

Riggs aims his Beretta at the target.

Riggs flashes his badge and draws his Beretta to break up a drug deal.

Riggs fires two Berettas akimbo at Travis and his thugs.

Lorna fires her Beretta during the housing development shootout.

Beretta 92FS Inox

Following the failed armored van robbery, Travis (Stuart Wilson) confronts the robber that managed to escape, one of his men pistol-whipping him with a Beretta 92FS Inox, stunning him and leaving him unable to escape as he's buried alive in concrete. The Beretta Inox is seen again when Riggs and Lorna drive away with the truck full of automatic weapons. One of the men has the Beretta in his hand when they pick up the guns in the road.

Beretta 92FS Inox 9x19mm

One of Travis' thugs pistol-whips the remaining armored van robber using his Beretta Inox with his finger on the trigger

Smith & Wesson Model 19

As in the other films, Detective Roger Murtaugh (Danny Glover) can be seen carrying a Smith & Wesson Model 19 as his standard weapon, though does supplement it with a semi-auto pistol as a backup, as mentioned below.

Smith & Wesson Model 19 .357 magnum. This is the actual Screen used Movie firearm - a custom ported Smith & Wesson Model 19 with black rubber grips, used and carried by Danny Glover in the film Lethal Weapon

After emptying his S&W 5906, Murtaugh pulls his Model 19.

Murtaugh's S&W Model 19.

Smith & Wesson 5906

As a backup to his usual revolver, Murtaugh can be seen using a Smith & Wesson 5906 pistol, most notably when engaging in a shootout with a group of gangbangers. He also carries it in lieu of his Model 19 when he and Riggs are busted to Patrolmen following a bomb incident at the start of the film, and has an accidental discharge while holstering his weapon, nearly shooting himself.

Smith & Wesson 5906 9x19mm

Murtaugh holstering his Smith & Wesson 5906 moments before an accidental discharge

Murtaugh wields his Smith & Wesson 5906 during a shootout with gangbangers

Smith & Wesson Model 29

Travis (Stuart Wilson) is seen loading a Smith & Wesson Model 29 with a 6 1/2 in. barrel, pachmayr grips, and loaded with armor-piercing bullets during their robbery at the LAPD impound. During the final battle at the housing development, Travis can be seen firing the revolver at Sgt. Cole. Thankfully, Lorna had worn two vests instead of one, so was saved from being killed by the powerful rounds, but was still seriously wounded. Although in reality, if a 9x19mm armor piercing round can penetrate a bulletproof vest so easily (As shown previously in the film) then a 44 Magnum (which is three times as strong) armor piercing round would easily penetrate two vest.

Smith & Wesson Model 29 .44 Magnum

Travis loading the Smith & Wesson Model 29 with the armor-piercing rounds.

Closeup of the Smith & Wesson Model 29 as Travis loads it with armor-piercing ammo.

Smith & Wesson 5904

During the armored van robbery, Billy Phelps (Mark Pellegrino), the robber driving the van, pulls out a Smith & Wesson 5904 while fighting with Riggs, but never gets the chance to fire the weapon. It's later revealed that the pistol was loaded with armor-piercing bullets.

Smith & Wesson 5904 9x19mm

Billy Phelps brandishes his Smith & Wesson 5904 while fighting with Riggs during the armored van chase scene

That looks like a 915, judging by the sights

Billy's Smith & Wesson 5904 lying on the floor of the van after being knocked out of his hand by Riggs

Smith & Wesson Model 586

Travis pulls a Smith & Wesson Model 586 on Captain Murphy (Steve Kahan) before taking him to the LAPD impound.

Smith & Wesson Model 586 .357 Magnum.

Travis draws his 586 on Murphy.

Smith & Wesson Model 60

Captain Murphy surrenders his Smith & Wesson Model 60 to Travis after being ambushed by him.

Smith & Wesson Model 60 .357 Magnum.

Murphy gives up his Smith & Wesson Model 60 to Travis.

Ithaca 37

Sgt. Lorna Cole is seen with an Ithaca 37 shotgun while Murtaugh interrogates various suspects.

Ithaca 37 12 Gauge.

Lorna holding her Ithaca 37.

Heckler & Koch P9S

At one point, Riggs and Murtaugh go to visit Murtaugh's daughter Rianne (Traci Wolfe) at her job, though Murtaugh fails to tell Riggs that her job is as an actress in a movie, and when Riggs sees an actor holding Rianne at gunpoint he charges in and tackles him, disarming him of his rubber Heckler & Koch P9S, though is quickly informed by Rianne that she wasn't in any real danger.

Heckler & Koch P9S .45 ACP

Martin Riggs holding a rubber Heckler & Koch P9S taken from an actor he mistakenly thought was threatening Rianne Murtaugh during filming of a movie

Heckler & Koch MP5K

There are several appearances in the film of the Heckler & Koch MP5K, first seen being fired out a car window by one of the gang bangers Murtaugh encounters, then by former officer Jack Travis (Stuart Wilson) during a high-speed chase with Riggs. Some of Travis' henchmen can also be seen firing them during the final battle, among other weapons.

Heckler & Koch MP5K 9x19mm

An MP5K is seen on the drawing table in Travis' trailer.

Walther PPK

Travis uses a stainless steel Walther PPK with matching silencer to execute Billy Phelps in the L.A.P.D. interrogation room. When Riggs and Murtaugh and Leo Getz (Joe Pesci) track Travis to a sports arena, Leo chases Travis onto the ice of an in-progress hockey game. During the scuffle between the two, Travis pulls out the Walther and wounds Leo before escaping. Although a minor injury, Riggs and Murtaugh deceive him into thinking it's a more serious wound in order to relieve themselves of his distracting presence.

Walther PPK .380 ACP with stainless steel finish

Travis prepares to use a suppressed Walther PPK to murder Billy Phelps in the interrogation room

Cobray M11/9

When Murtaugh engages the gang bangers, one of them opens fire on him with a Cobray M11/9, spraying and praying in an ultimately futile effort to take out the veteran cop. Upon discovering that the youth wielding it was a friend of his son, Murtaugh goes on a personal mission to find the ones responsible for giving him the illegal weapon. He also uses it to ignite a trail of gasoline spread by Riggs throughout the housing development during the final battle, and tosses the M11/9, loaded with armor-piercing bullets, to Riggs who uses it to kill Travis who is trying to run him down with a backhoe loader, the powerful rounds able to pierce the dozer blade that was impervious to normal bullets. As is the norm in many movies these days, this weapon appears as a stand in for the MAC-10, which it is refered to as by Lorna Cole. It is easy to tell that it is, in fact an M11/9 by its elongated reciever. It is even stated that the weapon is a 9mm. When learning the history of the Darryl's weapon, it is said that it had a 36-round magazine. They make 32-round magazines and 50-round magazines, but not 36.

SWD M11/9 9x19mm

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Lorna Cole with the M11/9 while detailing the weapon's criminal history. She incorrectly refers to it as a "MAC 10, 9mm, semi-automatic, converted to automatic with 36 rounds in the magazine."

In a scene from the Director's Cut, Murtaugh is seen holding the M11.

Ruger Mini-14

During the final battle, several of Travis' henchmen can be seen wielding Ruger Mini-14 rifles, most notably when Captain Ed Murphy's car is shot up when it is sent into the housing development Travis is operating from with the siren blaring and no driver.

Ruger Mini-14 .223 Remington

One of Travis' men fires the mini-14.

Steyr AUG

A Steyr AUG can be seen briefly in the pile of guns from a broken crate.

Steyr AUG 5.56x45mm

Travis' men pick up a pile of guns, including a Steyr AUG

Heckler & Koch MP5A3

During the final battle, several of Travis' henchmen can be seen wielding Heckler & Koch MP5A3's, most notably when Captain Ed Murphy's car is shot up when it is sent into the housing development Travis is operating from. Some of Travis' henchmen can also be seen firing them during the final battle, among other weapons.

Heckler & Koch MP5A3 9x19mm

One of Travis' men (Sven-Ole Thorsen) fires an MP5A3 at the approaching car.

One of Travis' men firing an MP5A3 at Riggs in the burning housing development.

Lethal Weapon 3

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