Dangerous and unusual? First,I thought that the basic idea behind firearms was that they were supposed to be dangerous and that the Founding fathers understood that firearms were dangerous when the crafted the Second Amendment.Second,given that the AR-15 is widely available today,as was the musket in 1776,on cannot reasonably consider the AR-15 to be "unusual".
But then one wouldn't expect a judge appointed by a man who can't even define the word "is" to understand such a nuanced concept.
(end sarcasm)