IS-3 is a beast but that gun on it is the exact same on the IS-2 IS-3 had a smaller tower with a bigger(still 122mm but better penetration) gun, take a look at WoT and you can get a lot of information about tanks from it and i wanna see an IS-7(they used it against germans but only in 1945, 6 IS-7 was created and still 1 is in good shape)
Stayfrosty
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