Or he's not an FFL. For someone to receive a gun out of state, they have to have an FFL. Either way, if you don't have an FFL, you will be required to overnight it to him. The fact that he wants to overnight it back, tells me he doesn't have an FFL. If he did, he can mail it priority back to you.
Sounds like your guy refinishes firearms, but isn't a dealer, or an FFL.
Check out Idaho Ordnance, The owner George does awesome work, and he will send it directly back to you.
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