I thought the AR-15s that the police carried in America were semi-auto. More like a sporting rifle than what the military uses.
AR-15s are more versatile than shotguns, though less powerful they are more accurate. If your going to carry a long gun around, it's probably the most logical option.
Basically anyone who isn't a prohibited person in America can field the same equipment. Though I think police have more access to restricted ammunition.
you are correct re: semi autos. most infantry would rarely use fully automatic fire with ar15 spec rifles too, as it is wasteful and inaccurate. exception being squad automatic weapons
echoing wat titanomachy said, there was a time where it was unthinkable to see police with anything more than a sidearm. a lot of police still had revolvers into the 90s as well.
AR-15s are more versatile than shotguns, though less powerful they are more accurate. If your going to carry a long gun around, it's probably the most logical option.
Basically anyone who isn't a prohibited person in America can field the same equipment. Though I think police have more access to restricted ammunition.