You can ship a firearm via UPS, FedEx, or (long guns only) USPS, but only to an FFL. For example, I shipped some pistols to a gunsmith I know who is an FFL, for him to work on and ship them back to me. Look at http://www.gunbroker.com/support/SupportFAQView.aspx?faqid=1118 for more info.
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