37 mm automatic anti-aircraft gun

The 37mm automatic anti-aircraft gun model 1939 (61-K) (GRAU index - 52-P-167) was a Soviet anti-aircraft gun developed during World War II. It was based on the Swedish 40mm Bofors gun and designed by M.N. Loginov. The 61-K was the first Soviet automatic anti-aircraft gun to be produced in large quantities. A family of naval anti-aircraft guns was also developed based on the 61-K, and the gun was installed on the first Soviet serial self-propelled anti-aircraft mount on the tracked chassis, the ZSU-37. The 37mm 61-K anti-aircraft guns were actively used throughout the entire duration of World War II and remained in service with the Soviet Army for a long time. In addition to their use against ground targets such as tanks, the 61-K was effective against ground attack aircraft, bombers, and dive bombers. In 1941, the gun was also used as an anti-tank weapon. After the war, many of these guns were exported to foreign countries and saw action in various post-war conflicts. The 61-K remains in service with the armies of many nations to this day.