What the Funk is that Airsoft gun?

A Home Made airsoft item, that actually works, now here's something unusual. The first time I saw this was in game and I just thought "WTF is that?" Hitting targets 60+ meters away using .30g BB's.
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M134 MINIGUN VIDEO https://www.youtube.com/watch?v=fiDlIe0VzJU

Player here
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