The 2A46 (D-81T) is a 125mm/L48 smoothbore cannon of Soviet origin used in several main battle tanks. It was developed by the Spetstekhnika design bureau in Ekaterinburg in the 1960s originally for the T-64A tank. They were then manufactured at Artillery Plant No.9 in Ekaterinburg and Motovilikha in Perm. Commercially produced versions 2A46, 2A46M, 2A46M-1 2A46M-2 2A46M-4 2A46M-5 and the KBA-3(Ukrainian). The early version of the 2A46 suffered from a short barrel life, but this was subsequently fixed on the 2A46M version. The Ukrainian KBA guns are derived from the 2A46 gun.