The weapon was later modified to include a telescopic sight and a new ball gun mantlet.
Nevertheless, the administrators at Uralmash were persuaded to proceed, and the new design was put into production. Initially the production factory at Uralmash rejected the proposed design. The version of this gun intended to be mounted upon the SU-85 was called the D-5S, with the "S" standing for self-propelled. Though much too large for the T-34 or KV-1 turret, it was thought the gun could be mounted upon the chassis of the SU-122 self-propelled gun to give the weapon mobility. Petrov's bureau developed the D-5 85 mm gun. Fyodor Petrov to modify the 85 mm anti-aircraft gun for use as an anti-tank weapon. Military planners directed the design bureaus of both Gen. In May 1943, work was begun on a new anti-tank gun.
Although the Panther was not seen in combat until July 1943, the new generation of German vehicles meant the Red Army would need a new, more powerful main gun for their armoured formations.
The Soviet command also had reports of the Panther tank, that was in development then and possessed thicker armor than the Tiger both represented an advance in German tank design. By the fall of 1942, Soviet forces began to encounter the new German Tiger tank, with armor too thick to be penetrated by the 76.2 mm guns used in the T-34 and KV tanks at a safe range. 7.1 Tanks of comparable role, performance and eraĮarly in World War II, Soviet tanks such as the T-34 and KV-1 had adequate firepower to defeat any of the German tanks then available.
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