How do I transfer a RESTRICTED fire arm to a buyer

[RangeBob]

You must ship by ground.. No xpresspost.

I thought that was only ammo.
That it was ok to ship firearms by the quickest means that Canada Post offered, that allowed for a signature required.

If there's something that says "adult" required, that's better. Otherwise you might end up in the newspaper with "child received gun, signed for it." as was in the papers earlier this year.