human
It can be done by experts slowing the video and counting or graphing the sound. The experts say the sound in Las Vegas has the rate of fire and characteristic sound of a modification you can do with parts you order or electronically print-- some of those are legal if you put them on yourself (how do they know"). I also recall that certain full automatic modifications by a gunsmith are illegal. But I could tell it was automatic or simulated automatic fire using a trigger device but no idea which kind-- but could tell someone had a lot of ammunition.
gpt
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