In most of Illinois this item is perfectly legal. The only places that have an issue with this are Cook County, Aurora, and Highland Park. The restrictions listed here budsgunshop.com/feeds/state_reg/illinois_restrictions.pdf are only in those areas, So as long as you do not live in any of those areas, you should be perfectly fine getting this.

Marrion, yes Sir. Illinois does not restrict the sale or possession of firearms that have been defined as assault weapons, or of magazines that can hold more than a certain number of rounds of ammunition, but some local jurisdictions such as Aurora, Highland Park and Cook County do restrict them. You are fine if you do not live in these Zip Codes : budsgunshop.com/feeds/state_reg/illinois_restrictions.pdf#%5B%7B%22num%22%3A34%2C%22gen%22%3A0%7D%2C%7B%22name%22%3A%22XYZ%22%7D%2C33%2C728%2C0%5D