[2] The KwK 30 also served as the basis for the 20 mm C/30, an aircraft variant mounted experimentally in some Heinkel He 112 fighters and proved to make an excellent ground-attack weapon during the Spanish Civil War.

Direct ground-attack was not considered a priority for the Luftwaffe and thus, the cannon was not used on other designs.

It was also used on the Sd.Kfz.251/17 Schützenpanzerwagen (2 cm) anti-aircraft vehicle, which had the gun on a pedestal mounting with a small armored turret to protect the gunner.

Late war, it was issued as a platoon commander's vehicle to replace the Sd.Kfz.251/10 Schützenpanzerwagen (3.7 cm PaK).

Average penetration performance established against rolled homogenous steel armor plate laid back at 30° from the vertical.