Smith & Wesson Performance Center Model 629 (Customized)
The modified Smith & Wesson Model 629 Performance Center used by Xander Cage (Vin Diesel) in the first XXX makes a return appearance in the sequel. Agent Toby Lee Shavers (Michael Roof) can be seen with it during the raid on the NSA compound before he and Gibbons make their escape using the GTO from the previous film. Darius Stone (Ice Cube) also uses the revolver when he breaks into the xXx headquarters.
Ruger GP100
Zeke (Xzibit) can briefly be seen holding a stainless Ruger GP100 revolver when he and Stone jack the government gun truck.
Pistols
Colt XSE M1911
Agent Augustus Gibbons (Samuel L. Jackson) keeps two customized Colt XSE pistols as his sidearms, and most notably wields them during the beginning shootout. Unfortunately, he loses the guns during the firefight, and they are later used to frame Darius Stone (Ice Cube) of a murder.
Beretta 92FS Vertec 1A
Darius Stone (Ice Cube) carries a Beretta 92FS Vertec 1A as his sidearm in the film. The Vertec 1A has an Elite II slide, but a perfectly vertical grip and front of trigger guard of vertec Series. Augustus Gibbons also briefly uses Darius' Beretta inside the Capitol building.
Heckler & Koch USP Compact Tactical
Most of General Deckart's (Willem Dafoe) troops use the Heckler & Koch USP Compact Tactical as their sidearms, including Deckart's right-hand man, Alabama Cobb (John G. Connolly). Charlie Mayweather (Sunny Mabrey) also uses one as her sidearm during the attack on the Capitol. General Deckart (Willem Dafoe) uses Cobb's USP Compact Tactical on the Presidential Bullet Train.
M1911
After Augustus Gibbons loses his customized Colt XSE 1911s, he uses a WWI dated M1911 pistol that he loses (yet, again) after Deckart frames his death.
Para-Ordnance P-10
When Gibbons sneaks into his basement, he opens a stash that contains some files and a stainless Para-Ordnance P-10. He never uses it, though, as he hears noises from upstairs and hides the files and the P-10.
SIG-Sauer P226R
Kyle Steele (Scott Speedman) and the rest of the NSA agents carry SIG-Sauer P226Rs as their sidearms in the film. Most of them can be seen fitted with rail-mounted weaponlights. The cops trying to stop Toby at the bridge after Stone's attack on the NSA base also use regular SIG-Sauer P226s. A SWAT team member also uses one during the raid on Pettibone's mansion. Shavers (Michael Roof) also uses one during the attack on the Capitol. A couple of US Secret Service agents also try to pull SIG-Sauer P226s during the attack on the capitol.
SIG-Sauer P228
An NSA Agent is briefly seen armed with a SIG-Sauer P228 during Stone's break into the xXx headquarters. A couple of cops at Pettibone's mansion also use SIG-Sauer P228 pistols.
Glock 17
One of the cops at Pettibone's mansion uses a Glock 17.
Glock 26
During the attack on the capitol, Charlie (Sunny Mabrey) has a USP Compact Tactical as her sidearm that she is seen wielding. There is a brief continuity error in the next scene, where her USP turns into a Glock 26.
Submachine Guns
Heckler & Koch MP5A2
Some of the NSA agents are armed with Heckler & Koch MP5A2 submachine guns during the beginning shootout.
Heckler & Koch MP5A3
A couple of SWAT officers wield Heckler & Koch MP5A3 submachine guns after the attack on the Capitol building.
In a deleted scene, Xander Cage (portrayed by an obvious stand-in) is seen wielding what appears to be a Heckler & Koch MP7 before he's killed. With the release of the sequel, however, this scene and Cage's death was rendered non-canon.
Heckler & Koch UMP
One of Zeke's (Xzibit) thugs carries a Heckler & Koch UMP fitted with a vertical foregrip during the attack on the Capitol building.
Rifles / Carbines
(Fake) Heckler & Koch XM8
All of the men under the command of Secretary of Defense George Deckart (Willem Dafoe), including Alabama Cobb (John G. Connolly), use Heckler & Koch XM8 rifles as their primary firearms throughout the film. These rifles are actually heavily modified Heckler & Koch G36Cs. Some of the men also have M203 grenade launchers fitted onto their rifles. During the attack on Capitol, Augustus Gibbons (Samuel L. Jackson) picks up one of these rifles, but exchanges it for Stone's (Ice Cube) Mk 46 Mod 0, which he uses for the rest of the scene.
Colt M16A2
The M16A2 assault rifle can be seen in the hands of the US Army soldiers and marines throughout the movie. One of Zeke's (Xzibit) thugs also also has one slung over his shoulder during the attack on the US Capitol.
Colt M4A1 Carbine
Some of the NSA agents and some NSA security forces at the xXx headquarters are armed with Colt M4A1 carbines throughout the film. Most of the carbines are fitted with Surefire M500AB forearm weaponlights. A couple of SWAT officers are also armed with M4A1s fitted with C-More red dot sights during the raid on the mansion. Kyle Steele (Scott Speedman) also uses one during the attack on the Capitol, fitted with the aforementioned weaponlight and a Leupold CQ/T scope.
Colt M4A1 (with M26 MASS)
Zeke (Xzibit) carries a Colt M4A1 fitted with a M26 Modular Accessory Shotgun System aka M26 MASS under the barrel. His M4 is also fitted with an AN/PEQ-2 designator. He most notably wields the setup when he, Stone and Steel jack a tank(!) during the attack on the Capitol.
M14
The US Navy honor guard carries and fires M14 rifles during the funeral of Augustus Gibbons (Samuel L. Jackson). Upon closer examination, however, only the rifle in the foregound is an actual M14, with the rest appearing to be Springfield M1As due to the visible hole in the stock where the selector switch should be.
IMI Galil MAR
One of Zeke's (Xzibit) thugs holds a Galil MAR, aka "Micro Galil" fitted with tactical equipment as Zeke, Stone, Shavers, and Steele come up with their plan for the Capitol.
SIG SG 552
One of Zeke's thugs is briefly seen holding a SIG SG 552 in Zeke's chop shop.
Remington 700PSS
A prison guard fires a Remington 700PSS at Darius Stone (Ice Cube) during the prison escape. A couple of SWAT sharp shooters also briefly carry Remington 700PSS rifles during the raid on the Mayweather mansion.
Shotguns
FN Tactical Police
One of the NSA agents wields an FN Tactical Police shotgun fitted with a vertical foregrip, tactical flashlight and a C-More red dot sight during the beginning shootout in the xXx headquarters. Augustus Gibbons (Samuel L. Jackson) picks up the shotgun after the agent is killed and his Colt XSEs run empty.
Mossberg 500
One of Zeke's (Xzibit) men carries a Mossberg 500 during the truck heist.
Remington 870
One of the SWAT officers that storm the Mayweather mansion carries a customized Remington 870 shotgun, fitted with a saddle shell holder and a dedicated forend flashlight.
Machine Guns
Mk 46 Mod 0
Darius Stone (Ice Cube) uses the SOCOM version of the M249, the Mk 46 Mod 0 as his primary firearm during the attack on the US Capitol building. Stone later trades the Mk 46 Mod 0 for a Heckler & Koch XM8 with an M203, originally picked up by Augustus Gibbons. The Mk 46 Mod 0 is fitted with a C-More red dot sight and tactical light under the barrel.
M240B
A thug in Zeke's chop shop can briefly be seen pushing a cart with a M240B machine gun on top.
M249E2
A woman in in Zeke's (Xzibit) chop shop briefly walks past the screen holding a M249-E2 machine gun.
Browning M2HB
Twin Browning M2HB machine guns are mounted atop the turret of the "stealth tank".
Other
M203PI Grenade Launcher
Some of the Heckler & Koch XM8 rifles wielded by Deckart' (Willem Dafoe) men have M203PI Grenade Launchers attached to their rifles. Most of the M203 have also vertical grips installed, so that one could use it as a stand-alone grenade launcher. Darius Stone (Ice Cube) detaches an M203 from an XM8 he takes during the attack on the Capitol, and uses it on the Presidential bullet train.
M136 AT4
One of the marines aboard USS Independence fires an M136 AT4 at the M2 Bradley commandeered by Darius Stone (Ice Cube).
Custom Rocket Launcher
Agent Toby Shavers (Michael Roof) makes Darius Stone (Ice Cube) a custom rocket launcher supposedly out of various car parts. Stone uses the launcher when he blows up one of the barns as a decoy when he infiltrates the xXx headquarters. The launcher is not a real life rocket launcher, as it was made purely for this film.
M242 Bushmaster Chaingun (prop)
While onboard the aircraft carrier, Darius commandeers an mocked-up M2 Bradley armored personnel carrier with a prop M242 Bushmaster chaingun as its primary armament. In real life, the US Marine Corps use LAV-25 amphibious armored personnel carriers instead of Bradleys (which are used by the US Army), but both have similar armament.
Arms Truck
When Darius and his co-conspirators stop a semi-truck, they uncover a massive weapons cache.
Stealth Tank
The "Stealth Tank" is a prop vehicle resembling a combination of the American M1 Abrams and German Leopard 2 main battle tanks; the armament configuration, with a roof-mounted secondary turret, seems to be based loosely on a T-72 variant fitted with twin AA guns on the sides of the turret. The vehicle was custom built for the production and all weapons on it are fabrications with the exception of the twin Browning M2s on top. The vehicle is apparently a cut-down Freightliner truck chassis fitted with rubber treads from a piece of construction equipment. This tank was modified to become the Decepticon Devastator / Brawl in the film Transformers.