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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 and as nose armament in several experimental anti-bomber aircraft, including variants of the Kawasaki Ki-45.
- Caliber: 37 mm (1.45 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)
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