You do not need to go thru an FFL. They're his guns. You're just delivering them to him. You can drive to IL and deliver them. It's that simple.
The FOID card allows him to possess and buy guns and ammo.
IL gun laws are not as onerous as the uninformed internet crowd make them sound. No registration. No magazine bans. No assault weapon bans.
As Muss said FOID has been in effect since 1968.

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183rd FBINA