The KV heavy tank was created and utilized as hefty break-through tank. To a tank of the task, the shortcomings of its L-11 main weapon, which will be not good at coping with enemies' bunkers and fortifications, might be deadly! So a heavy tank holding a much bigger weapon to raised perform the job was made along side the 76.2 mm weapon tanks. 1st of the kind uses a new big high turret of 7 edges that mounting the 152mm M-10 howitzer. This variation, which had numerous detail differences on later standard kind had been frequently dubbed KV 'Big Turret' or KV-2 Model 1939. As a result a huge turret on typical KV hull became really un-maneuverable it quickly earned a funny nickname of "Cellphone washroom"!