A single prototype was manufactured at the beginning of 1945. The vehicle underwent trials and was recommended for service. However, Japan was defeated before mass production could begin. After the surrender, the prototype was confiscated by American occupation authorities and was shipped to the United States.
Time for the successive autoreloading of each shell into the magazine.
The technical characteristics shown are for the Siege mode
Characteristics are specified for a vehicle with crew members trained to 100%.