Ho-203 was a Japanese autocannon that saw considerable use during World War II.

It was a long-recoil automation of the Year 11 Type direct-fire infantry gun.

It was fed by a 15-round closed-loop ammunition belt.

It was operationally used only as the nose gun of the Kawasaki Ki-45-KAIc and the Kawasaki Ki-102 heavy fighters of the Imperial Japanese Army Air Force.

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