id like to say that there was no apparent recoil from the rounds he was firing, there should be considerably more recoil. i still would not wish to be in front of that however.
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At 2:19 on this one he says he is using blanks.
https://www.youtube.com/watch?v=RQnWXEM_9bk
^^^ Let's see him do it with live ammo and see how many hits are on target. Just being fast is pointless. Fast and accurate wins!