One last thought about that dopey Nicole Karlis piece in Salon.
Even if it were the case that the 5.56mm round fired by the most common AR-type rifles were some special super-duper dangerous round because of its unusually high velocity — which is not actually the case — the 5.56mm round will perform in more or less the same way when fired out of any of the many non-AR rifles that are chambered for that round (assuming comparable barrel length and such). So, in that sense, Karlis’s claims about the special super-duper dangerous AR-type rifle aren’t even specific to AR-type rifles to begin with. Because a 5.56mm round fired out of a rifle with a wooden stock is a lot like a 5.56mm round fired out of a rifle with a black plastic stock.
I.e., the whole thing is dumber than nine chickens.