Just to clarify, the FOID approval process is effectively performed in every state for any gun purchase. It’s not like the FOID background check carries more scrutiny or anything. If a Texan resident can buy guns in Texas, they could get a FOID card if they lived in Illinois.

And it’s federally illegal to sell guns to non-residents of the state the sale is made in, so Chicago residents can’t buy guns in neighboring states. Indiana and Wisconsin residents could bring guns into Chicago, but that alone is highly illegal too.