Gc 20/40 (Germany)
Another variant of the Gc 20 anti-aircraft cannon, this time with an even longer barrel and a higher rate of fire. It was used in both stationary and mobile configurations.
Gc 20/45 (Germany)
This version of the Gc 20 featured a redesigned recoil system, making it more compact and easier to transport. It was used in both stationary and mobile deployments.