I don't think you can even have an AR in Cincy. They have strict gun laws within the city limits, which explains the extremely low incidence of violent crime and rioting.
Look at [URL=http://www.nraila.org/GunLaws.asp?FormMode=Detail&R=OH]Cincinnati Laws[/URL]
I found the following there:
The Cincinnati ordinance prohibits the possession of any semi-automatic firearm that was "originally designed with or has a fixed magazine or detachable magazine with a capacity of more than" 10 rounds for a rifle, 5 rounds for a shotgun and 15 rounds for a handgun. The Cincinnati ordinance also prohibits the possession of any detachable magazine with a magazine capacity in excess of 10 rifle rounds, 5 shotgun rounds or 15 handgun rounds. The Cincinnati ordinance exempts .22 caliber rimfire rifles which have fixed tubular magazines.