A friend of mine is trying to mail his .22lr rifle back to Keltec to get worked on and the USPS office in downtown Grand Rapids is refusing to mail it. He has tried several times even showing them all the pertinent laws etc that state that you can. They just keep saying my supervisor says no, my supervisor says no... etc. etc...

What can he do to force these dolts into complying with law and mailing his rifle back?