Check locally for firearm restrictions in IL. There is no statewide AWB or laws restricting magazine capacity. SBR are ok if you have a curio and relic license and jump through a bunch of hoops. No suppressors or full auto.

Crook county and some towns use local ordinances to enact gun control. These ordinances exist but are rarely enforced. The penalties usually include a fine and confiscation of firearm. The Cook County AWB allows for incarceration of up to 6 months. I am not aware of anyone ever getting locked up for this.