Hi Bryant and welcome. Unfortunately, no, this firearm as configured is not legal in the State of IL. Threaded Barrel, Magazine outside of grip, Barrel shroud etc. Details under C: Semi-Auto Pistols here: budsgunshop.com/feeds/state_reg/illinois_restrictions.pdf

Hi Bryant, no sir. Prohibited -
A semiautomatic pistol that has the capacity to accept a detachable magazine or that may be readily modified to accept a detachable magazine, if the firearm has one or more of the following:
❌ i. a threaded barrel;
ii. a second pistol grip or another feature capable of functioning as a protruding grip that can be held by the non-trigger hand;
❌ iii. a shroud attached to the barrel or that partially or completely encircles the barrel, allowing the bearer to hold the firearm with the non-trigger hand without being burned, but excluding a slide that encloses the barrel;
iv. a flash suppressor;
❌ v. the capacity to accept a detachable magazine at some location outside of the pistol grip; or
vi. a buffer tube, arm brace, or other part that protrudes horizontally behind the pistol grip and is designed or redesigned to allow or facilitate a firearm to be fired from the shoulder.
budsgunshop.com/feeds/state_reg/illinois_restrictions.pdf