No state laws regarding mag cap. Cook county has some kind of BS law but I am not in Cook county so I do not know for sure what it is. In Illinois AR and AK type rifles are fine. Same for high cap pistols.
Most of Illinois is pretty sane, it is The Chicago metro area that is far left gun haters.

Ernie

George Washington - �Labour to keep alive in your breast that little spark of celestial fire,�conscience.�

God save the Republic