76.2 mm anti-aircraft gun Model 1935 (34-K)

The 76.2 mm anti-aircraft gun Model 1935 (34-K) (76.2-мм зенитная пушка обр. 1935 г. (34-К)) is a 76.2 mm Soviet naval anti-aircraft gun. It was developed during the 1930s and used during World War II.

Background
The 55-caliber gun was derived from a German weapon licensed in 1930. The initial attempt to put the gun on a naval mount was a failure. The Kalinin factory started work in 1934 on a new design that was accepted in late 1936. It entered production before the end of the year as the 34-K and 285 were built before the end of 1941. The manually operated mount weighed 4.95 MT. The same mount was combined with the Army 85 mm gun as the 90-K system beginning in 1942.

Development of a twin-gun electrically powered mount also began in 1936, but it was not accepted until October 1939 as the 39-K. Only 15 mounts were produced before production ceased. Work on a simplified twin-gun mount began in 1939; only six 81-K mounts were built and they were installed on the battleships SOVIET BATTLESHIP Marat and SOVIET BATTLESHIP Oktyabrskaya Revolyutsiya in 1940. The 39-K weighed about 12.5 MT and the 81-K approximately 12 MT.