Developed in 1934–1935 at the Experimental Kirov Plant in Leningrad. Variants with frontal and rear placement of fighting compartment were designed. Never saw service or mass production.
Time for the successive autoreloading of each shell into the magazine.
Characteristics are specified for Siege mode.
The technical characteristics are displayed for the charged turbine 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%.