[JCWohlschlag]

Originally Posted by Xringshooter

As long as it is a long arm USPS will send it. You do need to fill out a USPS Form 1508. Whoever told you that you can't is wrong. They need to read their own regulations. If they argue, ask for the Postmaster. If the Postmaster tells you that you can't, go on line and print out the appropriate section and show them. If they still won't then write to the Postmaster General. When I get the time I will research the section that explains it ans post it or edit my original post.

USPS Domestic Mail Manual — Section 601: Mailability

From page 58:

11.3: Rifles and Shotguns

Although unloaded rifles and shotguns not precluded by 11.1.1e and 11.1.2 are mailable, mailers must comply with the Gun Control Act of 1968, Public Law 90-618, 18 USC 921, et seq., and the rules and regulations promulgated thereunder, 27 CFR 178, 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 gun is unloaded and not precluded by 11.1.1e.