After the Pz.IV was abolished, the progress of the Pz.V project, which was initiated almost at the same time, was prioritized. Compared with Pz.IV, Pz.V obviously followed a more conservative and rational path in the concept of heavy tank development. Its weight is moderate, its cost is moderate, its manufacturing difficulty is moderate, and it adopts a new armor layout, so that it can obtain the highest equivalent armor thickness with as light a weight as possible. In terms of configuration, it is equipped with a classic ZIS-6 gun, (now it seems that the country really prefers this Soviet classic anti-tank gun developed in the Second World War, Because of its extensive use during World War II, in 1944 the country developed a new type of armor-piercing projectile suitable for this gun, which is a new type of armor piercing ammunition made of tungsten alloy and similar to short-cased armor-piercing ammunition, so the country did not develop new tank guns in a short period of time. A fls-42 15.8mm coaxial machine gun. This car is the first prototype built in 1946, known as Vk50.1. In 1947, the country secretly transported a number of Vk50. 1 to the front line of the conflict, planning to conduct actual combat tests. After testing, its effect was good.