The Flakvierling (Flugabwehrkanone vierling 38, literally "anti-aircraft defense cannon quadruple (model) 38") is an anti-aircraft weapon encountered in the Call of Duty games set in World War II as well as a brief appearance in the zombies map Zetsubou No Shima in Call of Duty: Black Ops III, often as a mission target and rarely as a player-controlled fixed weapon. In missions, they are often simply referred to as "flak guns."
Call of Duty and United Offensive
In Call of Duty, the Flakvierling appears as a controllable weapon in "Airfield," where Sgt. Evans uses it to take out incoming Ju-87 "Stuka" dive-bombers that threaten to kill the player before they can escape. The shells are slow to travel to their target, but can destroy a plane in one-to-three hits. The Flakvierling shares the same black T-shaped crosshair used by the FlaK 88, and like the 88 it has no ADS mode, always using the crosshair only. The weapon traverses slightly more quickly than the FlaK, but still slower than the player can turn.
The weapon is encountered elsewhere; in "Ste. Mere-Eglise" they are seen mounted on Flakpanzers, while on "The Eder Dam" and at the "V-2 Rocket Site" they are seen as ground mounts. In all three, they must be destroyed with timed explosives. On Battleship Tirpitz, they are simply scenery. A Flakpanzer is also shown on Call of Duty's box art.
In Call of Duty: United Offensive, the Flakvierling is usable in two separate locations on "Kharkov 2." After clearing the main square of Wehrmacht infantry, Yuri Petrenko uses the Flakvierling to shoot down incoming enemy bombers. In the final firefight in the rail station, a Flakvierling is usable. It can be used to take out incoming tanks, half-tracks, infantry, and Ju-87 "Stuka" dive-bombers. Because of its fully-automatic fire, it is extremely effective against ground vehicles, destroying them in a matter of seconds. It also has a radius of explosion damage, making it useful against taking out groups of infantry.
Although game files for the Flakvierling exist in multiplayer, they are not usable in either game's multiplayer.
Call of Duty: Finest Hour
Call of Duty 2
The Flakvierling makes its a minor appearance in Call of Duty 2, specifically in the campaign level "Assault on Matmata," where the player is ordered to use it at the very end of the mission to take out Ju-87 "Stuka" dive-bombers. It doesn't overheat or run out of ammo, so the player is free to shoot without impudence.
Call of Duty 2: Big Red One
- "This German anti-aircraft gun could be fired either in diagonally opposite pairs or all four barrels at once. Also effective against tanks."
- — Description
The Flak Vierling (referred to as Quad 20mm Flakvierling in the Bonus Materials) featured in Call of Duty 2: Big Red One is very different to the previous versions, and appears in "We've Been Through Worse" and "Baptism By Fire." In "Baptism By Fire", the player is ordered to control it and take out multiple Ju-87 "Stuka" dive-bombers.
Call of Duty 3
- "2cm FlaK 38 "Flakvierling". Devastating four-barreled 20mm anti-aircraft cannon employed by German military in multiple roles. 220-480 rounds per minute rate of fire. Effective range of 2200 meters."
- — In-game description
Call of Duty: Roads to Victory
In Call of Duty: Roads to Victory, the Flakvierling appears in several levels throughout the game, in missions "Sloedam", "Arnhem Fire" and "Rhine Crossing". The player could only eliminate the Germans using them in "Sloedam" and "Rhine Crossing", while he blows them up in "Arnhem Fire".
Call of Duty: World at War (Nintendo DS)
The Flakvierling 38 appears in the Nintendo DS Call of Duty: World at War game.
Call of Duty: Black Ops III
A Flakvierling can be seen in the zombies map Zetsubou No Shima atop a hill near Lab A.
Call of Duty: WWII