100mm BS-3 anti-tank gun serving as a monument in Korolyov.
Source: Dmitry Ivanov -
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The BS-3 was armed with a 100mm rifled gun that would also be used in the World War 2 era SU-100 tank destroyer and the post war T-54 and T-55 family of main battle tanks.
The BS-3 was a major step up from the ZiS-3 with its 76.2mm ordnance. The BS-3 could engage any German armored vehicle, whereas the ZiS-3 struggled to penetrate late war German tanks and assault guns.
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