Developed in August 1941 at the Construction Bureau of Plant No. 37 under the supervision of N. A. Astrov. The vehicle came into service in September 1941. The vehicle was mass-produced until February 1943. A total of 5,920 vehicles were manufactured. The vehicle saw service before the end of the war.
Time for the successive autoreloading of each shell into the magazine.
Characteristics are specified for Siege mode.
Characteristics are specified for Rapid mode.
Reload time of the first and second guns on double-barreled vehicles.
Characteristics are specified for vehicles with crews trained to 100%.