Shipping Regulations

The Bureau of Alcohol, Tobacco, Firearms and Explosives, Firearms Regulation Reference Guide, Section 478.147 specifically states (this information can also be verified by calling any BATF office),

"A person not otherwise prohibited by Federal, State or local law may ship a firearm to a licensed importer, licensed manufacturer, or licensed dealer for any lawful purpose, and not with standing any other provision of this part, the licensed manufacturer, licensed importer, or licensed dealer may return in interstate or foreign commerce to that person the firearm or a replacement firearm of the same kind and type. A person not otherwise prohibited by Federal, State or local law may ship a firearm curio or relic to a license collector for any lawful purpose, and notwithstanding any other provision of this part, the license collector may return the interstate or foreign commerce to that person the firearm curio or relic."

https://reedercustomguns.com/information/shipping_info.htm