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You need a special ID to buy firearms in the state of Illinois and many places will NOT Ship you a firearm unless you fax or email them a copy of said foid.
Thing is, while many of these sites WILL sell you a firearm provided you give them a copy of your Foid, they WILL NOT sell you a black powder pistol, foid or no foid.
Thing is, there is no IL law that says one can't own a black powder gun, and they are for sale here at many places.
So I don't get why these online retailers will sell you a pistol or rifle with a smile as long as you send a copy of your foid, but won't on black powder pistols. Michigan is another state listed on sites, and they have lax gun laws (can open carry) versus IL.