In my former department, we had Mossberg 590's, with ghost ring sights (not necessary IMO), standard length mag tubes, Speedfeed stocks and 18" cylinder bore barrels. It was optional to carry one, and only myself and one other officer did.
Only 5 of us were qualified to carry AR's. They had to be in .223. I carried mine in the trunk in a hardcase. The shotgun was the one which rode with me in the rack. I carried 00 Buck loads in the mag tube, and 4 slugs in the speedfeed stock.
In most situations, the shotgun will be more effective than the rifle. I wouldn't waste my time carrying a pistol caliber carbine. It does nothing out to 100 yards I can't do with my issue gun. Try hitting a perp in the torso with your pistol caliber carbine or .223, then a slug or shotgun. Much more energy transfer with the shotgun.
That said, I don't like cylinder bore for police work, either. At 25 yards, our shotguns couldn't keep all the pellets on a downsized MA "Q" target. I bought my own Mossy 590 with a 20" cylinder bore barrel, extended mag tube and standard bead sights (fine out to 100 yards), and I'm having it threaded for choke tubes. I'll be using a full-choke.
Only 5 of us were qualified to carry AR's. They had to be in .223. I carried mine in the trunk in a hardcase. The shotgun was the one which rode with me in the rack. I carried 00 Buck loads in the mag tube, and 4 slugs in the speedfeed stock.
In most situations, the shotgun will be more effective than the rifle. I wouldn't waste my time carrying a pistol caliber carbine. It does nothing out to 100 yards I can't do with my issue gun. Try hitting a perp in the torso with your pistol caliber carbine or .223, then a slug or shotgun. Much more energy transfer with the shotgun.
That said, I don't like cylinder bore for police work, either. At 25 yards, our shotguns couldn't keep all the pellets on a downsized MA "Q" target. I bought my own Mossy 590 with a 20" cylinder bore barrel, extended mag tube and standard bead sights (fine out to 100 yards), and I'm having it threaded for choke tubes. I'll be using a full-choke.