In 1944, the Germans were actively developing heavy anti-tank guns. Since it was clear that mounting larger and larger guns in conventional methods was nearly impossible to do, they offered some different self-propelled gun designs to meet such requirement, and one of them was to use the Panther hull, the also called as Waffenträger Panther concept.
Based on the blueprint, it would use the 12,8 cm Pak 44 L/55 heavy anti-tank gun. But in theory, Waffenträger Panther would also be able to mount much bigger guns ranging from 15 cm – 17 cm caliber. The concept should be, more or less, similar with the North Korean M-1978 Koksan, also armed with an 170 mm anti-tank gun of unknown origin.
