The IS tanks were a series of heavy tanks used by the soviets being used in ww2 and the Cold War with the last IS being the IS7 the first IS was modelled after the kv 1 it was equiped with two guns for two variants the IS1 and the IS2 the IS1 was equipped with the 85mm canon while the IS2 was equipped with a 122mm canon the 122mm being better being able to penetrate panther frontal armour.it good.
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