Developed in the summer and fall of 1942 at the Construction Bureau of the Gorky Automobile Plant under the supervision of N. A. Astrov. The vehicle came into service in December 1942. A total of 85 vehicles were mass-produced.
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%.