USPS Mailing FirearmsThese are the USPS rules, does not mean your postmaster will follow them or that you have to follow them also.
432.3 Rifles and Shotguns
Except under 431.2, unloaded rifles and shotguns are mailable. Mailers must comply with the rules and regulations under 27 CFR, Part 478, as well as state and local laws. The mailer may be required by the USPS to establish, by opening the parcel or by written certification, that the rifle or shotgun is unloaded and not ineligible for mailing. The following conditions also apply:
Subject to state, territory, or district regulations, rifles and shotguns may be mailed without restriction when intended for delivery within the same state of mailing. These items must:
Bear a “Return Service Requested” endorsement.
Be mailed using a class of mail, product, or Extra Service that provides tracking and signature capture at delivery.
A rifle or shotgun owned by a non-FFL may be mailed outside the owner‘s state of residence by the owner to himself or herself, in care of another person in the other state where he or she intends to hunt or engage in any other lawful activity. These mailpieces must:
Be addressed to the owner.
Include the “in the care of” endorsement immediately preceding the name of the applicable temporary custodian.
Be opened by the rifle or shotgun owner only.
Be mailed using a class of mail, product, or Extra Service that provides tracking and signature capture at delivery.
Mailing of rifles and shotguns between licensed FFL dealers, manufacturers, or importers are not restricted. The Postal Service recommends that these items be mailed using a class of mail, product, or Extra Service that provides tracking and signature capture at delivery.
Rifles and shotguns may be mailed by a non-FFL owner domestically to a FFL dealer, manufacturer, or importer in any state. These items must be mailed using a class of mail, product, or Extra Service that provides tracking and signature capture at delivery.
Except as described in 432.3a, licensed curio and relic collectors may mail firearms meeting the definition of curios or relics under 27 CFR 478.11 domestically to licensed FFL curio and relic collectors in any state. These items must be mailed using a class of mail, product, or Extra Service that provides tracking and signature capture at delivery.
Firearms meeting the definition of a rifle or shotgun under 431.4 which are certified by the curator of a municipal, state, or federal museum, which exhibits firearms to be curios or relics of museum interest, may be accepted for mailing without restriction when mailed between governmental museums.
Air guns (see 431.6) that do not fall within the definition of firearms under 431.1a are mailable. A shipment containing an air gun with a muzzle velocity of 400 or more feet per second (fps) must include an adult signature service under DMM 503.8. Mailers must additionally comply with all applicable state and local regulations.