USpolitics

Depending on how the gun was configured/chambered, and weather conditions, I think it's quite hard. Also considering he probably only had shooting range experience, and was a kid under heavy stress.

Also not American, but at roughly the same age trained on the HK G3, which uses a bigger caliber and longer barrel, under simulated stress conditions could hit a target at about 400m reliably. After intensive training, and "hit a target" does not necessarily mean a headshot, but somewhere on the body. We were explicitly told to aim for the biggest mass, not fanciness.

I think that shooter was misguided in many ways, and also by advertising, as already mentioned in this thread.