The Pak 43 (Panzerabwehrkanone 43) was a German 88 mm anti-tank gun developed by Krupp in competition with the Rheinmetall 8.8 cm Flak 41 anti-aircraft gun and used during the Second World War. The Pak 43 was the most powerful anti-tank gun of the Wehrmacht to see service in significant numbers. The Pak 43 was an excellent weapon, able to penetrate the heaviest Allied tanks at combat ranges, including the Soviet IS-2 and the American M-26 Pershing.
To simplify production some were mounted on the two-wheel split-trail carriage from the 10.5 cm leFH 18 field howitzer, resulting in a version known as Pak 43/41. The 43/41 proved heavy and awkward to handle in the mud and snow of Eastern Front and gunners referred to 43/41 as the "barn door" (German: Scheunentor), a veiled reference to the size and weight of the gun. Nevertheless the Pak 43/41 proved just as effective as the earlier Pak 43.