Footages of 2cm Flak 30 Opel Blitz in Italy 1944. The Flak 30 (Flugzeugabwehrkanone 30) The Flak 30 (Flugzeugabwehrkanone 30) and improved Flak 38 were 20 mm anti-aircraft guns used by various German forces throughout World War II. It was not only the primary German light anti-aircraft gun but by far the most numerously produceda German artillery piece throughout the war.lt was produced in a variety of models, notably the Flakvierling 38 which combined four Flak 38 autocannons onto a single carr