Your reply is misplaced. AR Pistol or rifle, you can see its effectiveness from the fact that 10 people are dead and no injuries reported. With a traditional pistol, unless its a head shot, you have a 90% survival chance given immediate medical attention. I am just commenting on facts, not diving into minutia like the reduced velocity due to shorter barrel. If you had one to trade I would not take it. I went the full SBR route.
A couple of young men ran out of the store and reported. They said that the dead victims stood still instead of running. They were likely shot point blank. I’ll concede pistols and head shots, though, and have sneered at complainers on ranges after practicing and qualifying with head shots since the ‘80s. ;)