If there is no stock on the Receiver Extension, and if it is originally registered as a pistol receiver, then there is no Fed-violation. I can't say about IL. laws.
All AR Pistols (apart from certain Oly models) require the Receiver Extension, as it is part of the AR recoil system.
The BATFE has asked that individuals not have stock-capable Extensions and an unused stock body at the same location, but has decreed that both the A2 style as well as tele-stock Extensions are both technically legal (again, from a Federal standpoint).
The only real question regarding the item you saw at the store is how it was registered. If it is reg'd as Pistol, it is Kosher.
Hope that helps.
Judge justly. Do not favour the wicked. Uphold the cause of the weak and fatherless. See right done to the afflicted and destitute. Rescue the weak and needy, and save them from the clutches of the wicked. -- Psalm 82:2-4 positively stated.
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