After the tests of German-made Hagler bullets proved the possibilities of that type ammunition in perforating steel plate, the National Ammunition Factory in Skarżysko-Kamienna was ordered to develop its own 7.92 mm cartridge with a muzzle velocity of over 1,000 meters per second.
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Simultaneous to the development of the ammunition, a young graduate of the Warsaw University of Technology, Józef Maroszek was ordered to design an anti-tank rifle.
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It was originally developed for the PTRS and PTRD anti-tank rifles, but was later used as the basis for the KPV heavy machine gun that formed the basis of the ZPU series anti-aircraft guns that is also the main armament of the BTR series of armoured personnel carriers from the BTR-60 to the BTR-80.
Anti-tank rifleman Mikhail Panikakha was attempting to defend his position with Molotov cocktails.
They were vulnerable to the British 0.55 inch (14 mm) Boys anti-tank rifles.
The vehicle had an unusual internal arrangement, with three-man crew sitting side by side by side with the driver in the middle, a crewman manning a small multi-sided turret mounting Bren light machine gun at the right side, and another with Boys .55 inch anti-tank rifle (mounted in brackets in the hatches on the hull roof) and access to radio set at the left.
The armament consisted of a hull-mounted Boys anti-tank rifle and a Bren light machine gun in a small open-topped turret.