“That’s handguns only. If you pass the background check, you can buy a long gun in any state. BTDT.”
You can’t legally make an interstate purchase of a long gun without going through an FFL in your own state.
“Long guns can be purchased and transferred to a resident of any state in any state provided that the transfer is legal in both the purchaser’s state and the state in which the transfer is taking place.”
https://www.cabelas.com/assets/product_files/pdf/federal_state_firearms_regs_online.pdf