Hmm, yeah, I spent a bunch of time checking the others, but kind of assumed the last one must be an IS-7, however the turret doesn't quite look right. It doesn't look quite right for the T-10 either though, at least to me, the turret seems too long somehow, at least in the front? But the muzzle brake is definitely very distinctive, and points to it being a T-10 (at least the later production models), so I dunno.

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I guess that might actually be the thicker portion at the base of the barrel, rather than part of the turret, but when the cannon is positioned parallel to the hull like in the image it looked like part of the turret to me.