While all Type 99s are labeled as simply Type 99 model 2 (with exception of X-ray view defensive turrets as Type 99 model 2 mark 5), there are variants between them that mainly only reflect in ammo count: ![]() The projectiles used are identical to the Model 1, but the cartridge employed contains approximately 40% more propellant than the older type, thereby increasing the velocity of the Model 2 to a respectable 750 m/s as opposed to the Model 1's 600 m/s. The barrel protrudes 18 inches beyond the leading edge when mounted in the wings of fighter aircraft. The principal differences between Model 2 and Model 1 consist of a longer barrel, longer chamber, and longer cartridge to boot. It was mounted on nigh every IJN aircraft in a pair or quad setup, allowing for a significant firepower boost that helped the fighters of the time compete with the exceedingly well-armed American aircraft that they faced. The 20 mm Type 99 Model 2 was the main aircraft cannon for the Imperial Japanese Navy during WW2, replacing the earlier drum-fed Type 99 Model 1.
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