Type 4 20mm twin AA machine cannon
Type	Autocannon
Place of origin	Empire of Japan
Service history
In service	1944–1945 [1]
Used by	Japan
Wars	World War II
Production history
No. built	500 [1]
Specifications
Barrel length	1.4 m (4 ft 7 in) L/70 [2]
Shell	20×142 mm [2]
Caliber	20 mm (0.79 in) [2]
Action	Gas operated
Rate of fire	600 rounds/min (maximum)
Muzzle velocity	950 m/s [2]
Maximum firing range	5,500 m (18,000 ft) (horizontal) 3,500 m (11,500 ft) (altitude) [2]
Feed system	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 guns were produced. ^{[1] [2]}

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]}

References

Notes

Sources

• War Department TM-E-30-480 Handbook on Japanese Military Forces, September 1944.
• Taki's Imperial Japanese Army Page: Type 4 20 mm twin AA Machine Cannon - Akira Takizawa
• Taki's Imperial Japanese Army Page: Type 98 20mm AA Machine Cannon - Akira Takizawa