25 mm automatic air defense gun M1940 (72-K)

25 mm automatic air defense gun M1940 (72-K) (25-мм автоматическая зенитная пушка образца 1940 года (72-К)) was a Soviet 25 mm caliber anti-aircraft gun. The gun was created in the beginning of 1940 at 8th Kalinin Artillery Plant in Kaliningrad under the guidance of its Chief Designer Mikhail Loginov.