The Seventh Circuit has determined that Illinois' felon in possession of a firearm is broader than the definition of a firearms-related aggravated felony because Illinois' statute criminalizes possession of pneumatic weapons. The court further determined that the conviction is indivisible. As such, a conviction under Illinois' felon in possession of a firearm statute will never qualify as a firearms-related aggravated felony.
The full text of Rodriguez-Contreras v. Sessions can be found here: