Warlord Games T34/76 Platoon in polystyrene - 'hard' plastic.
What you get in the box are kits to build three T34 models. You get a choice of three different turret types classed according to year of build. The Soviet Union had a policy of evolutionary upgrade rather than revolution in tank design to keep the production lines flowing. The USA had a similar philosophy with Sherman and light tanks - and the wisdom of this approach is supported by considering who won.
Also in the box were three tank commanders, eight infantry, and three sheets of tank decals.
I chose to build three identical tanks from the middle period of the T34/76 production - sounds a bit like an archaeologist describing pots - to simulate the great tank battles of 1943. This is the period when the Soviet and German were perhaps most evenly matched.
My tanks are 'Guards' with appropriate slogans on the turret, not that I have a clue what they say. I chose to use only one tank commander to indicate an HQ vehicle. Soviet doctrine at this point was for the commanders to remain inside the tank in combat.
The gun barrels are from the extra stuff in Plastic Soldier's Soviet anti-tank gun kits. You get two guns for £15 with six gun barrels - four spare in every box.
I heartily recommend Warlord's box of goodies: at £50 it is a great buy.