Walter, Under the ATF's FAQ the line on shipping through the USPS explains a nonlicensee in any state may ship to an FFL in any state. I don't know if this answers your question or if you require the specific regulation for your purpose? ATF REGULATIONS Title 27 CFR CHAPTER II sections 478.29, 478.30 and 478.31 are pertinent- unfortunatly I found them once, but can't again!