Development of KV-220 on the basis of the KV heavy tank started in the summer of 1940. A prototype was built on December 5. Unlike other KV modifications, the tank featured an elongated hull, additional support roller, enhanced armor (100 mm), and a new turret with the 85 mm F-30 gun. In the fall of 1941, production of the KV-1 was discontinued. The vehicle received the mass-produced KV turret and was sent to the frontlines.
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The technical characteristics shown are for the Siege mode
Characteristics are specified for a vehicle with crew members trained to 100%.