2cm FlaK 38

The 20mm FlaK 30 was Germany's standard light anti-air weapon during WW2. It was later upgraded into the far more common FlaK 38 described in this article. Unlike other weapons of a similar role and calibre, its rate of fire was notably low. The Germans solved this by strapping a quadruple stack of 2cm FlaK 38 autocannons on a single mount, calling it the Flakvierling configuration. The FlaK 38 is still a formidable autocannon, and has found a home in the turrets of many mechanised vehicles, even in the middle of the Cold War.