I don't watch movies, but I did see something like that on TV while I was trying to find something more intellectual to watch.
It's fake.
Real General Electric Mini-guns fire the .308 cartridge (actually the 7.62 NATO). The guns weigh almost 200 pounds and are electrically operated.
Movie version? I didn't see any power cables and it looked like it weighed twenty pounds or so.
There's also the tiny little details of ammo feed and recoil. If it fires 6,000 rounds a minute, a five-second burst burns 500 cartridges. You see your hero hefting that many? How about the feed belts?
Oh, and recoil. One 308 from the hip - no sweat. 500? Yeah, right.
BTW, yup, I HAVE fired one for real. It was mounted in a helo door. Cambodia, 1971. Ruined the day of a gomer with an SKS - big time.
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