| Type 99 | |
|---|---|
 Top:a Type 99 Mark 1 cannon ; Below: a Type 99 Mark 2 cannon | |
| Type | Autocannon Machine gun (official designation) |
| Place of origin | Empire of Japan |
| Service history | |
| In service | Mark1 1939-45; Mark 2 1942-45 |
| Used by | Imperial Japanese Navy Air Service (IJNAS) |
| Wars | World War II |
| Production history | |
| Designed | 1937 |
| Specifications (Mark 1) | |
| Mass | 23 kg (51 lb) |
| Length | 1,330 mm (52 in) |
| Cartridge | 20×72RB |
| Caliber | 20 mm (0.787 in) |
| Action | API blowback |
| Rate of fire | 520 rpm |
| Muzzle velocity | 600 m/s (2,000 ft/s) |
| Feed system | drum or belt-fed |
The Type 99 Mark 1 machine gun and Type 99 Mark 2 machine gun were Japanese versions of the Oerlikon FF and Oerlikon FFL autocannons respectively. They were adopted by the Imperial Japanese Navy (IJN) in 1939 and served as their standard aircraft autocannon during World War II.[1]
- ^ "cannon « Catalog of Enemy Ordnance". www.lonesentry.com. Archived from the original on 2010-01-02.