| Type 4 20mm twin AA machine cannon | |
| Origin: | Empire of Japan |
| Type: | Autocannon |
| Is Ranged: | yes |
| Is Artillery: | yes |
| Service: | 1944–1945 |
| Used By: | Japan |
| Wars: | World War II |
| Number: | approximately 500 (an alternate source states 616 units produced) |
| Part Length: | 1.4m (04.6feet) L/70 |
| Cartridge: | 20×142 mm |
| Caliber: | 20mm |
| Action: | Gas operated |
| Rate: | 600 rounds/min (maximum) |
| Velocity: | 950 m/s |
| Max Range: | 5500m (18,000feet) (horizontal) 3500m (11,500feet) (altitude) |
| Feed: | 2x 20 round box |
Type 4 20 mm twin AA machine cannon was an Imperial Japanese Army (IJA) anti-aircraft gun. It consisted of two Type 98 20 mm AA machine cannon. It was introduced in 1944 and approximately 500 to 616 guns were produced.[1] [2] It was mainly designed for use against ground targets, but was only used in an anti-aircraft role.
The Type 98 20 mm AA machine cannon was the most common light anti-aircraft gun of the Japanese military and the IJA used it until the end of World War II.[2] [3]