Ho-204 cannon

Ho-204 was a Japanese aircraft autocannon that saw limited use during World War II. It was the largest gun to see active service derived from the Model 1921 Aircraft Browning. It was used as upward-oblique armament in the Ki-46-III.

Specifications

 * Caliber: 37 mm (1.45 in)
 * Overall length: 2,390 mm (94  in)
 * Barrel length: 1,260 mm (49.6  in)
 * Ammunition: 37 x 144 (475 g)
 * Weight: 130 kg (285 lb)
 * Rate of fire: 400 rounds/min
 * Muzzle velocity: 710 m/s (2,330 ft/s)