Russia’s new Armata tank (T-14) The platform’s chief tank (T-14) sports an unmanned remotely controlled turret armed with a brand new 125 mm 2A82-1M smoothbore cannon. Its muzzle energy is greater than one of the world’s previously considered best cannons: the German Leopard-2 Rheinmetall 120 mm gun. The 125 mm gun has 15-20 percent improved accuracy and its rolling fire angular dispersion has improved 1.7 times.