The ATC-50 is a 50mm small anti-tank gun that was deployed and served in the country in 1938. It is light in weight and small in size, and can fire tungsten alloy armor-piercing shells, shrapnel high-explosive shells, and smoke shells. It was almost everywhere in the Second World War. Reality proves that it has a good effect on light tanks and some armored vehicles, but in the later period of the war, it can only be used as a field artillery, its anti-tank ability is seriously lagging behind, and when it is equipped with an improved tungsten alloy penetrator, its maximum penetration depth is 72mm.