<--------Postal Employee...... Maybe a box inside a box, but that packaging is unacceptable for the system. Yes, modern firearms can be shipped USPS, if declared to be so, and proper paperwork is done and ATF laws are adhered to. My opinion,... you are SOOOO much better to ship it Fedex or UPS. Much easier and may not wind up in Targeted mail bin which create delays like you have never seen.