The 85 mm air defense gun M1939 (52-K) (Russian: 85-мм зенитная пушка обр. 1939 г. (52-К)) was an 85-mm Soviet air defense gun, developed under guidance of leading Soviet designers M. N. Loginov and G. D. Dorokhin. This gun was successfully used throughout the German-Soviet War against level bombers and other high- and medium-altitude targets. In emergencies they were utilized as powerful anti-tank weapons. The barrel of 52-K was the base for the family of 85-mm Soviet tank guns. Crews of 85-mm AD guns shot down 4,047 Axis aircraft. The mean quantity of 85-mm ammunition required to shoot down one enemy plane was 598 rounds. Ingame, the 52-K is a very good and powerfull weapon. It can penetrate nearly any German armor and its available single or in battery off 4 guns. The gun can been found in the best seller movie "Der Untergang".