Just went onto USPS's website and looked at Publication 52 , pages 77-80 which covers all this. Long guns can be shipped as long as it meets the federal guidelines ( which does allow person to ffl transfers and back on a firearm going in for custom modifications and / or repair of long guns ) . Handguns , SBRs and SBSs have further restrictions and are not applicable in my case. Form 1508 is a registration paper which must be on file by any FFL dealer . It applies to dealers only , so again , not applicable here. Thanks for the heads up , though.
Chris