The tank had a hexagonal gun turret and on the left side of the turret roof was a commander's cupola. In front of that was a crew hatch. Originally, the prototype tank was to be fitted with the same Type 5 75 mm tank gun (based on the Type 4 75 mm AA Gun) used on the Type 4 Chi-To. A secondary weapon of a fixed front hull-mounted Type 1 37 mm tank gun was fitted in the position normally taken by a machine gun. Alternatively, the design called for using two Type 97 heavy tank machine guns in place of the front hull-mounted Type 1 37 mm tank gun. Accordingly to another source, the design called for a ball mount for a Type 97 machine gun on the left side of the turret for use in close combat situations. There were also plans for a Type 5 Chi-Ri II, to be diesel powered and using the Type 5 75 mm tank gun as its main armament.