I was reading about the free upgrade that Sig offers owners of the P320. I would like to have that done. However, I don't know the rules or procedures for shipping a firearm through the mail. I only know the Supreme Court recently rules that you are allowed to do that.
What you do is contact SIG and do what they tell you to. P320 Voluntary Upgrade Program | SIG SAUER When shipping a firearm ... don't ask us. Ask the manufaturer or supplier on how to return a gun based on their and federal guidelines.