Interesting. I know the national crime rates are down and I had heard the theory that people stocking up on guns and ammo might have had an effect. Chicago doesn’t allow guns - and the number of homicides there has received a lot of publicity. So yes - I also would question if the official records say the crime rates are down.
Not True.
It's only handguns that are outright banned (plus 'assault rifles'), for now anyway.
But you can own / possess a 'typical' Shotgun or a 'typical' Hunting Rifle. You 'just have to' register them with the Chi PD and renew it each year, which almost nobody does anyway.
Chicago has 39 pages of Firearm Regulations in size 4 font.
You can read or download them via the IL State Police Website.