ATF, in response to the president's Government Paperwork Elimination Act (GPEA), Public L. No 105-277, signed in 1999, and requests from the firearms industry, has developed the e-Form 4473 to assist in the proper completion of the Federal Firearms Transaction Record (ATF Form 4473).
USPS Regulations for Shipping Firearms
UPS Regulations for Shipping Firearms
FedEx Regulations for Shipping Firearms