The ShKAS (Shpitalny-Komaritski Aviatsionny Skorostrelny, Shpitalny-Komaritski rapid fire machine gun for aircraft; Russian: ШКАС - Шпитальный, Комарицкий, Авиационный, Скорострельный) is a 7.62 mm machine gun widely used by Soviet aircraft in the 1930s and during World War II. It was designed by Boris Shpitalniy and Irinarkh Komaritsky and entered production in 1934. ShKAS was used in the majority of Soviet fighters and bombers and served as the basis for the ShVAK cannon.