| Ho-204 cannon | |
| Origin: | Imperial Japanese army |
| Type: | Aircraft cannon |
| Is Ranged: | yes |
| Is Uk: | yes |
| Weight: | 130kg (290lb) |
| Length: | 2390mm |
| Part Length: | 1260mm |
| Cartridge: | 37 x 144mm |
| Caliber: | 37mm (475 g) |
| Action: | Short recoil-operated |
| Rate: | 400 rounds/min |
| Velocity: | 710m/s |
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.[1]