Ho-3 cannon

Ho-3 was a Japanese autocannon used during World War II. It was a drum-fed improvement of the magazine-fed Ho-1 cannon, itself derived from the Type 97 antitank rifle. It was used by the Kawasaki Ki-45KAIc heavy fighter of the Imperial Japanese Army Air Force.

Specifications

 * Caliber: 20 mm (0.8 in)
 * Ammunition: 20 x 125 (164 g)
 * Weight: 43 kg (95 lb)
 * Rate of fire: 300-400 rounds/min
 * Muzzle velocity: 820 m/s (2,690 ft/s)