Just send it as long as his state doesn't have any stupid gun laws. Just say it's his. Or USP it to his house and put your name on the from and too.
Sent my brother his old Mauser converted to a deer rifle a few years ago via UPS-- SC to TX no trouble.
Long guns can even be shipped USPS as long as it's going to the owner. Put his name on the from and to person.
The only cautionary note I can think of when using USPS these days is the inevitable delays to deliveries. I'd look into UPS before USPS.
Pay for next day delivery and they will chase you down for your signature. The .410 will run about $125.00 to your destination.