Type 99 Cannon - Type 99-2

Type 99-2

The Type 99-2 was a heavier weapon with a stronger recoil, and was not put in use by the IJN before 1942. It was used exclusively in fixed installations, i.e., either in fighters or in power-operated turrets. The Type 99-2 was carried by later models of the A6M, starting with the A6M3 model 22a, and on later Navy fighters such as the Kawanishi N1K-J.

The Model 4 of this weapon adopted the same belt-feed mechanism as the Type 99-1 Model 4. The Type 99-2 Model 5 resulted from attempts to increase the rate of fire. By modifications that included the addition of strong buffer springs, the rate of fire was raised to between 670 and 750 rpm. But the Model 5 was formally adopted only in May 1945 and may not have seen combat.