Ill order directly from GM and have them sent to a relative Stateside.......I have a GM ball barrel for my .54 Renegade and it's a shooter..........Harold
To bring that barrel to Canada you'll need an export permit from a licenced exporter; and you need an import permit (to get the export permit).
Bringing it across without permits is illegal and you risk serious consequences. This topic has been covered in depth (do a search), so read up and make sure you understand the rules to protect yourself.
FYI: I have a green mountain 20" barrel and I very much like it. It has a bentz chamber. It feeds no problem and very accurate.
so assuming I'm buying from a licenced exporter, do I as the buyer need to do any paperwork on the canadian side?