crossing the border with guns

[PJgunner]

I don't know the form number, but take a gun that has a serial number. Customs has a form you fill out that will make it simple to bring the gun back into the U.S., but it has to have a serial number. Prior to the 1968 Gun Control Law, rifles were not required to have a serial number, so your gun is not illegal.
I would contact your nearest customs agent for the forms. They have to verify that the numbers are correct, but from what I understand, there's no big hassle. Basically, all the form is for is to prove you didn't buy the gun in Canada. Could save you from having it confiscated.
Paul B.