Here a squematic of the Mauser MG 213 wich is the "father" of all the aircraft revolver cannons. The gun used a part of the gasses to move a slide back and forward for managing the extraction and introduction in the chamber of cartrigde cases. It fires ellectrically.
To say it in short terms : it combined the action of a revolver with one of a semiauto pistol.
The french DEFAs, the US Pontiac M39 and the british ADEN family are all "modern" variants of the german gun.
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