1/56 (28mm) Flakpanzerkampfwagen IV (3 cm MK 103 Zwilling) , "Kugelblitz" ( German: Kugelblitz - " ball lightning ") - a German experimental self-propelled anti-aircraft gun (ZSU) during World War II . Created by Daimler-Benz in 1944 , on the chassis of the most common medium tank PzKpfw IV . To install a rotating turret of a special design, the shoulder strap of the Tiger tank was used . (Patreon)