“The other thing is that I know of no magazine for these rifles that holds more than 40 rounds. So this guy is full of it!”
But otherwise, he is definitely full of it. You still have to change mags, even if you come to the event with them pre-loaded.
Oh, and those larger capacity mags have a reputation of being jam-o-matics...so you are probably not going to get off 150 rounds in anywhere near 15 seconds.
“Just FYI, there are 60-round and 100-round mags out there.”
Yeah, I have seen those, but tactically, they are just nuts because of their size and weight. Having the shooter get a hernia trying to lift up an AR with one of them attached and get anything on a target is nuts. Same for bump stocks. I just think it’s a sideshow to talk about fire rates because they are simply a number, but not based in real time situations.