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And he was shooting those at the ground, as he got out of the car? But no sound? Please look back at the video if you haven't seen it. It looked like someone shooting a gun like that in a video game. Is that what it looks like to shoot 5.56 45mm rounds? I just found a video on YouTube, a guy shooting those rounds...The gun has a back-lash and the way I see it in your video, it looks like this guy was shooting it with one hand, and a bunch of them, at the ground...Surely, he would have had a back-lash, shot himself in the foot or broke the pavement? And no sound? How's that possible?
This is the video:

Those are tracer rounds in the video, they light up to produce a trace that the rifleman can use to guide his shots. It's common in military attack helicopters. And sentry automated machine turrets that would litterally trace the tracer round.

The flickering as he got out of the car is due to a tactical flash light with a strobe feature to disorient the target.

I have held a shotgun that was lighter than a pistol. An AA-12 shotgun is such an advanced shotgun it has basically no kickback.

So it's a strobe? No bullets then?

Probably the civilian version called .233 Remington.

Good to know, after I find out I will add it to the article