 An improved version, the 2 cm KwK 38 L/55 "(2 cm Kampfwagenkanone 38 L/55)", was used on the Sd.Kfz.121 Panzerkampfwagen II "(Ausf.J models onward)".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.