Weapons of various kinds are seen throughout Underworld, being used by various characters. Most weapons are either made of silver, or are loaded with silver bullets, due to the extreme allergy to silver exhibited by Lycans. Ultraviolet ammunition is used by the Lycans to take advantage of the Vampires’ allergy to sunlight.
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Walther P99 (Two tone modified)
In addition to her Beretta 92FS handguns, Selene also uses a pair of two-tone Walther P99s fitted with Laser Devices BA-5 laser sights at the bottom of the barrels. The guns have been modified to lessen the weight required on the trigger, allowing Selene to fire them almost as if they were fully automatic, which the sound editors for the film must have decided they were, since the weapons report like submachine guns. You can see Selene pulling the trigger for every shot, but you hear fully automatic fire.
Walther P99 (Standard)
The Desert Eagle, nickel plated and chambered in .44 Magnum, is seen in the hands of mostly the Lycans. They are loaded with hollow bullets filled with a special irradiated fluid that emits ultraviolet light: "Sunlight used as a weapon". The first one to carry the gun was Trix and it was his gun that Selene took back to Kahn in order for him to analyse the new UV Rounds. Eventually Lucian is seen taking up the Desert Eagle and loading up on UV Rounds in order to combat Viktor and his Death Dealers.
Heckler & Koch USP MATCH
A 9mm Heckler & Koch USP MATCH equipped with a Jet Funnel extended magazine makes its first appearance when it is given to Selene by Kahn to test out. When she fires it, silver liquid comes out of the target, and we learn that the gun is loaded with Silver Nitrate bullets which were copied from the Lycan's ultraviolet ammunition, and are very lethal to the werewolves as it allows silver to flow into their blood stream. The gun is later stolen by Erika, under the orders of Kraven. Kraven then uses the gun to shoot Lucian and Michael Corvin. The final whereabouts of the gun are never revealed, but according to the Evolution novelization, Kraven had simply discarded it as he escaped from the Lycan Den. It should be noted that silver nitrate is actually clear in liquid form, but the liquid used resembles mercury.
Heckler & Koch USP Compact
Heckler & Koch USP-9
A Heckler & Koch USP-9 is given to Michael Corvin by Selene when he is chained to a chair at the Vampire safe house, and attempts to free himself by shooting the chain with the gun but fails.
Heckler & Koch MP5K (with and without PDW folding stock)
Most of the Death Dealers in the film use Heckler & Koch MP5K submachine guns both with and without PDW folding stock. Since they lack the extended barrels, they are not actual MP5K-PDWs.
Heckler & Koch MP5A3
Both the Vampires and Lycans can be seen using Heckler & Koch MP5A3s on several occasions. The Lycan's MP5s are mostly seen with tactical flashlights on the foregrip.
In the firefight at the beginning of the film, Raze uses two Steyr TMPs to battle the Vampires in the subway. Several are also seen in Ördögház's armoury.
ZB vz. 26
During the scene when Selene is discussing with Kraven and Kahn about the likely-hood of there being a new Lycan lair, it cuts to a gun rack, where a Czech ZB vz. 26 Series submachine gun is seen.
After the firefight in the subway, the Lycan leader Lucian breaks up a fight between two werewolves (Pierce and Taylor) by firing a Franchi SPAS-12 shotgun with a shortened barrel and magazine tube in the air and telling them that they are behaving like rabid dogs. A Lycan is also seen loading one up before the final battle.
Rifles / Carbines
Colt M4A1 Carbine
Towards the end of the film, Kahn can be seen with an M4A1 Carbine, fitted with a scope, a laser pointer and a Surefire M500AB tactical flashlight in the foregrip. The lower receiver lacks the "fencing" around the magazine release, which means it's actually an M4 barreled upper receiver mounted onto an early Colt SP1 (original M16) 'slab side' lower receiver. Since so many SP1 lower receivers were converted to full auto fire (for movie use) in the last three decades, this is a common practice.
Heckler & Koch G36KV
Many of the Lycans use Heckler & Koch G36KVs in the film, may of which have flashlights taped on top of the forends.
During the scene when Selene is discussing with Kraven and Kahn about the likely-hood of there being a new Lycan lair, it cuts to a gun rack, where several AKMs can be seen. When the the Lycans are loading up, several AKMs can be also seen being handed out. It is possible some of these may be milled receiver Norinco Type 56s.
Colt AR-15A2 Sporter II
During the scene when Selene is discussing with Kraven and Kahn about the likely-hood of there being a new Lycan lair, it cuts to a gun rack, where a Colt AR-15A2 Sporter II is seen with many other weapons. One is also seen in Ördögház's armoury.
During the scene when Selene is discussing with Kraven and Kahn about the likely-hood of there being a new Lycan lair, it cuts to a gun rack, where an Enfield L85A1 is seen with many other weapons.
Steyr AUG A1
During the scene when Selene is discussing with Kraven and Kahn about the likely-hood of there being a new Lycan lair, it cuts to a gun rack, where a Steyr AUG A1 is seen with many other weapons.
During the scene when Selene is discussing with Kraven and Kahn about the likely-hood of there being a new Lycan lair, it cuts to a gun rack, where what appears to be AKMSU assault carbines are seen in the gun racks, based on their lack of full stocks and short barrels.
In Ördögház's armoury, there are AMD-65s on the racks.
Heckler & Koch PSG1
In Ördögház's armoury there is a Heckler & Koch PSG1 Sniper Rifle leaning against the wall.
Two GE M134 Miniguns are seen in the Ördögház's armoury.
An MG 34 is seen on the top shelf of the rack in Ördögház's armoury. Another may be lying flat next to it, but it's too hard to see fully.
RPD Machine Gun
An RPD light machine gun is seen behind Selene in Ördögház's armoury.
What appears to be the club stock of an RPK light machine gun is seen in Ördögház's armoury.
When the Death Dealers were infiltrating the Lycan Den, Kahn throws one Silver grenade down on the lair's entrance, killing Pierce, Taylor, and several other Lycans who were nearby.
Selene uses shurikens to stop Raze's attack on her after she killed Trix.
Main article: Weaponry of Underworld/Gallery
- Weaponry of Underworld: Evolution
- Weaponry of Underworld: Rise of the Lycans
- Weaponry of Underworld: Awakening
- Weaponry of Underworld: Blood Wars