For example, the Russian military has lost T-90S, T-90A, and T-90AK tanks ... That version of the tank sports a 125 mm 2A46 ...
Main Armament: 2A46M-5 125 mm smoothbore gun (T-90M) 2A46M-2 125 mm smoothbore gun (T-90A) 2A46M 125 mm smoothbore gun (T-90) ...