Whoa, I started to comment the rules. Then I noticed you didn't specify what type of firearm.
The rules differ between a handgun or a rifle/shotgun.
If it's a handgun he has to go back home and receive it thru a ffl dealer
If it's a rifle or shotgun you can transfer it to a ffl dealer here and then he can go in and fill out the 4473 and receive it.
No transfers between private individuals who are NOT residents of the same state are allowed. Federal law not state law.
This, long gun through FFL here, handgun through FFL in his home state.