the Police cronies will tell you, only a company with a manufacturing licence.
i think the question is, do you need a specific license to product a metal tube with thread on one or both ends.
From a blank anyone can. From an existing barrel... only a gunsmith for specific reasons. (And even that has some debate)
I phoned the rcmp to ask about machining a 26" .22 barrel down to 18.6" which would leave me 7" to play with as a new barrel for another gun, and was told it was OK to use the cutting off, but since the cut off was under 18.5" it is illegal... two different people two different answers.
Whether it's threaded on one or both ends would seem to be irrelevant because some rimfire barrels aren't attached to the receiver with threads, including models from CZ, Tikka, and Anschutz.
The barrel itself is not a licence-required firearm part, is it? That is to say, do you need a PAL to buy a barrel? If not, why would a machinist require special dispensation to cut a barrel blank to whatever length he wants? I don't know the answer to this but does a gunsmith who cuts a barrel blank to a certain length have to account for the leftover pieces? Or can he do with them what he wishes?
I thought no barrel cut off was illigal unless it was shorter than 4.2 inches,
The barrel itself is not a licence-required firearm part, is it? That is to say, do you need a PAL to buy a barrel? If not, why would a machinist require special dispensation to cut a barrel blank to whatever length he wants? I don't know the answer to this but does a gunsmith who cuts a barrel blank to a certain length have to account for the leftover pieces? Or can he do with them what he wishes?