What makes the AR-15 style rifle the weapon of choice for mass shooters?

[Pyromancer]

If you know the enemy and know yourself, you need not fear the result of a hundred battles. If you know yourself but not the enemy, for every victory gained you will also suffer a defeat. If you know neither the enemy nor yourself, you will succumb in every battle.
Sun Tzu, The Art of War

Wtf. NES is quoting someone else under my screen name?

 

[Pyromancer]

weird - I never posted this

Yeah I'm getting incorrectly quoted too!?

 

[Picton]

Wtf. NES is quoting someone else under my screen name?

Feds must be bored.

 

[Mesatchornug]

Feds must be bored.

Control chips are kicking in.