But I don't know why, according our Vice President, double barrel shotguns are more effective as a combat weapon.
I actually saw an Iraqi soldier with one of those one time. He kept asking me for shells.
Post Vietnam should have been the start of the introduction for the AR to law enforcement. It got such a bad rap there through lies, urban legends and half truths that most departments would not adopt it.
Today there is little doubt to its reliability and effectiveness.