Sorry but, it's a Huge No for Illinois.
The Illinois law bans what the state defines as assault weapons, including the AR-15 rifle, as well as large-capacity magazines that hold more than 10 rounds of ammunition for long guns or more than 15 rounds of ammunition for handguns.Jul 2, 2024

Hi Guy and welcome. Unfortunately, no Sir due to the combination of detachable magazine, Pistol Grip and Flash Hider. Cheers and stay safe! Details under Rifles here: budsgunshop.com/feeds/state_reg/illinois_restrictions.pdf

Hi Guy, no sir, Prohibited - A semiautomatic rifle 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 pistol grip or thumbhole stock;
ii. any feature capable of functioning as a protruding grip that can be held by the non-trigger hand;
iii. a folding, telescoping, thumbhole, or detachable stock, or a stock that is otherwise foldable or adjustable in a manner that operates to reduce the length, size, or any other dimension, or otherwise enhances the concealability of, the weapon;
❌ iv. a flash suppressor;
v. a grenedae launcher;
vi. 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.
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Details here budsgunshop.com/feeds/state_reg/illinois_restrictions.pdf