Mailing a long gun USPS

[arbud]

Sorry if this has been beaten to death.
Can private individual mail a long gun to an ffl in another state
Can I being a private individual box up a long gun in a long box take it to the counter of a usps branch pay to have it shipped to Billys guns (fictitious) in florida and leave.
The ATF website says I can, I just dont want to have to be holding my breath and wonder if they are going to ask me whats in the box and then say no.

[Xringshooter]

By USPS regs yes you can. Long arms (rifles and shotguns) can be shipped using USPS by any individuals. Handguns can be shipped by USPS but only FFL's can do this.