Japan Steel Works
Whereas the Type 90 used the same 120mm Rheinmetall main gun as other Western powers, the Type 10 uses a completely new gun, developed indigenously by Japan Steel Works. The Type 10's new cannon can fire an improved round, the newly developed Type 10 APFSDS round, which is specifically designed for and can only be fired by the Type 10. The Type 10 APFSDS round is composed of amorphous metals containing heavy metal particles. It has high rigidity and is self-sharpening, Lightweight ammunition is fired at high initial velocity (Estimated 1,850 m/s up to 1,900 m/s) due to high cavity pressure. The 120 mm Japan Steel Works L/44 has 640 MPa pressure and shoots a 7.8 kg projectile, while the Rheinmetall Rh-120 L/55 120 mm has 580 MPa pressure and shoots the DM53 8.35 kg projectile at 1,750 m/s. It is designed to penetrate hybrid reactive armor such as Реликт (Relikt). The Type 10 tank can also fire the JM33 APFSDS (license produced DM33 shell acquired from Germany) as well as all standard 120 mm NATO ammunition.