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20 mm caliber is a specific size of popular autocannon ammunition. The dividing line between smaller-caliber weapons, commonly called " guns ", from larger-caliber " cannons " (e.g. machine gun vs. autocannon ), is conventionally taken to be the 20 mm round, the smallest caliber of autocannon.
The Oerlikon 20 mm cannon is a series of autocannons based on an original German Becker Type M2 20 mm cannon design that appeared very early in World War I. It was widely produced by Oerlikon Contraves and others, with various models employed by both Allied and Axis forces during World War II. Many versions of the cannon are still used. [2] [3]
The HS.820 is a 20 mm caliber autocannon developed by Hispano-Suiza primarily for aircraft use, but more widely used in a series of ground-based anti-aircraft guns. After Oerlikon purchased Hispano's armaments division in 1970, the HS.820 became the Oerlikon KAD, supplanting Oerlikon's own KAA and KAB weapons in the process. [1]
45.5 kg (100.31 lb) Length: 2,207 mm (86.9 in) Barrel length: ... The M621 is a 20 mm automatic cannon of French design, ... 20 mm modèle F2 gun; M197 electric ...
The M61 Vulcan is a hydraulically, electrically, or pneumatically driven, six-barrel, air-cooled, electrically fired Gatling-style rotary cannon which fires 20 mm × 102 mm (0.787 in × 4.016 in) rounds at an extremely high rate (typically 6,000 rounds per minute).
57 kg (126 lb) Length: 2.1 m (6 ft 11 in) Barrel length: 1.45 m (4 ft 9 in) (barrel) ... The Polsten was a Polish development of the 20 mm Oerlikon gun. The Polsten ...
The Meroka CIWS is a Spanish Navy 12 barrelled 20 mm close-in weapon system (CIWS), using twelve Oerlikon 20 mm/12 guns mounted in 2 rows of 6 guns each. [1] [2] The system's primary purpose is defence against anti-ship missiles, and other precision guided weapons. However, it can also be employed against aircraft, watercraft, coastal targets ...
Nevertheless, the Mk 12 was standard cannon armament on gun-armed American naval fighters and attack aircraft from the early 1950s to the early 1970s, including the F4D Skyray, F3H Demon, A-4 Skyhawk, F-8 Crusader, F-11 Tiger and early navy versions of the LTV A-7 Corsair II.