A prototype tank that appears famously in World of Tanks and War Thunder called the FV4005.
It's turret is shaped like a barn, with very little armor, housing a 183mm Gun that fires HESH, also known as 🅱️ESH.
It is decently fast but finds trouble aiming due to a lack of any elevation or depression of the gun.
It is basically a british KV-2.
That Shitbarn just nuked a fellow Progetto 46!