High Quality Content by WIKIPEDIA articles! 122 mm corps gun M1931 (A-19) (Russian: 122-мм корпусная пушка обр. 1931 г. (А-19)) was a Soviet field gun, developed in late 1920s and early 1930s. In 1939 the gun was replaced in production by an improved variant, M1931/37. The piece saw action in World War II with the Red Army. Captured guns were employed by Wehrmacht and the Finnish Army.