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.
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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.