OC for Tactical Advantage
If you only have 4 years experience then sit down.
Mailing a firearm is identical in all ways but 2, to mailing anything else.
1: You have to use a private service like UPS or FedEx, and 2: you have to mail it to your local FFL, not your house.
How many years of experience do you have flying with a firearm?
I can mail a Christmas present from my house with a stamp on a card, if it's any more complicated than that to mail a firearm you're wrong.