In early 1943 5./ZG 1 received several aircraft equipped with the Bordkanone BK 3.7, autoloading 37mm heavy cannon for evaluation as an anti-tank aircraft.
/ ZG 76 were based around Prague, and operating a number of Bf 110G-2/R1 types with an under-slung BK 3,7 37 mm cannon in a conformal-mount ventral gun pod.