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I have one of those also - there was a whole series made with minor differences. I have no data on bullet weight or muzzle velocity, but it must have hit at least 4,000 fps.
The GAU-6 is described and illustrated in Chinn. It was a six-barrel rotary, like a small M61 Vulcan. It was only ever made experimentally in .50 BMG calibre, since the problems with getting the 10mm ammo to work properly were not resolved before the gun was cancelled. Bizarrely, the GAU-6 was intended for the F-15 fighter, which was a deeply silly notion by a school of thought in the USAF which held muzzle velocity to be more important than anything else.
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