The DEFA cannon (Direction des Études et Fabrications d'Armement) is a family of widely used French-made aircraft revolver cannon firing 30 mm caliber NATO standard rounds. == Design history == The initial DEFA 551 was developed in the late 1940s.
The DEFA cannon (Direction des Études et Fabrications d'Armement) is a family of widely used French-made aircraft revolver cannon firing 30 mm caliber NATO standard rounds. == Design history == The initial DEFA 551 was developed in the late 1940s.
Source: Wikipedia "DEFA cannon" · CC BY-SA 4.0
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