KV-2 - a heavy assault tank with the M-10 152 mm howitzer, the KV-2 was produced at the same time as the KV-1. Due to the size of its heavy turret and gun, the KV-2 was slower and had a much higher profile than the KV-1. The extra weight also increased the breakdown rate of the vehicle and production was soon halted. The original KV-2 was built on the chassis of the KV-1, while the improved KV-2B was built on that of the KV-1 model 1940 (KV-1A). 334 KV-2 was produced.