Amphibious Tank PT-76 was produced between 1951 and 1967 and was in service in about 40 countries. About 3,000 tanks were issued. One of the versions of deep modernization of the tank was supposed in Moscow by "Special Engineering and Metallurgy," and included the installation of a new turret with a new set of weapons and a new diesel engine. The main weapon is a 57-mm anti-aircraft automatic gun S-60 with the current FOS. As a result, the firepower of the tank increased by 5.5 times. The installation of ETD-23 engine increased the mobility of the tank by 30%.