 Planned primary armament of the tank though was the ballistically improved 125 mm 2A66 (also known as D-91T) smoothbore gun.Together with the tank gun, a new uranium-cored sub-caliber armor-piercing APFSDS rounds were developed called Anker-1 and Anker-2, as well as new HEAT shells, and GLATGM missiles.The 2A66 had a different appearance to the 2A46M.