If it counts, my primary experience was with the semi-automatic Colt 9mm carbine. We purchased two or three of these at around the same time we transitioned from revolvers to pistols. Because only supervisors could be trusted with this devastating firepower, only sergeants and shift OIC's were trained with the Colts. As we all know, first line supervisors are selected for their marksmanship and tactical acumen. In fact there was such concern that officers would play with the weapons, we were told to keep a gun lock on the carbines when storing them in the shotgun locker.
As I recall, the Colts had a carry sling and two magazines apiece. There were no lights or optics. I don't recall any accuracy or reliability problems. A couple of officers did purchase their own weapons. In fairness, I should have given the Colts more respect, but the lead firearms instructors at the time were basically teaching us how to fight the Soviet Army if it burst through the Fulda Gap into Maryland.
I invariably carried a shotgun rather than a Colt as I was more experienced with the slide gun and could carry it racked above my head rather than thrown in the trunk. On Day 2 of the Beltway sniper case, we had multiple shootings around the city. I was at the range with an in-service class when we were directed to gear up and hit the streets. A couple hours later I was ordered to meet another unit detailed to a school. When I arrived, the officer handed me a Colt and told me I was supposed to give him my shotgun. Since he wasn't a supervisor, he wasn't authorized to carry the AR-15 (though as an Army veteran, he had more experience with the platform than me).
Given the distances of the shootings, the trade-off may have been in my favor. That said, I didn't think so as I pulled up first behind one of the many white box trucks we were checking. After the ordered the little old man and woman drivers from the truck, I moved up to clear the passenger compartment. Sixteen years later I vividly remember pieing the cabin thinking "If that douchebag is waiting in here, I really would rather have my shotgun than this thing." Good times.
The 9mm AR-15's were soon gone. Botach International shipped us replacement Colt rifles on our verbal promise to send them the pistol-caliber weapons.