I don't want to sperg out on the gun stuff too much. Anyone who remembers what fats proudly did to his Glock 23 knows he's full of shit. Unless I missed some update, the shooter wasn't using any optics, just iron sights. A city block is usually 100 yards. Imagine trying to line up rifle sights, under pressure, to get rounds close, but ultimately miss someone's head at more than 100. Titty Rick is dumb.
I haven't been able to verify it, but I saw multiple people claim that the rifle was DPMS. That brand is widely considered shit tier. Who knows? From the picture I saw, it looked totally basic. No free float handguard. No optics. Basic ass looking trigger. There are a lot of factors involved, but a rifle, like any other machine, has mechanical limitations. If all these things are true, and my understanding is correct, an excellent shooter should be pretty happy averaging a 3 inch group at 100 yards. Again, no way to get that close and miss intentionally.
I could go on with the 600 yard pipe dream and talk about combat zeros, but what's the point? Rick is fat, and no one wants to have sex with him. I would not fart in Boxcar Nikki's vagoo.