Or, cut a 16 inch AR barrel, not a 20?
Actually... read the legislation again... carefully...
(b) a firearm that is adapted from a rifle or shotgun, whether by sawing, cutting or any other alteration, and that, as so adapted,
(i) is less than 660 mm in length, or
(ii) is 660 mm or greater in length and has a barrel less than 457 mm in length,
It doesn't say anything about what length the barrel started at... we just like to assume that's what they meant but what they said was if you take a rifle or shotgun (any barrel length) and if you "saw, cut or alter" that rifle or shotgn
and if, as a result of those alterations, the overall length becomes less than 660mm or the overall length is 660mm or greater but the barrel is less than 457mm long then you've created a "Prohibited" firearm.
Technically speaking if the rifle started out as a 16" barrel (or whatever length) with overall rifle length of 661mm and you cut the stock off so that overall length is now 659mm you've created a "Prohibited" firearm. (This was really what they were trying to stop... the old "sawed off shotgun"... but they worded the legislation poorly, as they so often do).
If you start with a rifle that has a 16" barrel and overall length of 661mm and you remove the stock and replace it with a factory folding stock you have NOT created a "prohibited" firearm but you may have created a "Restricted" firearm depending on overall length.
If you start with a rifle that has a 16" (or 18" or 24") barrel and you cut it down to 14.5" (an AR for example) then under the wording of the law you've created a prohibited firearm... but if you buy a 14.5" upper from your friend (or a gunsmith or a store) and install it on your AR then you have not done anything wrong and CFC will issue you a revised registration certificate showing the new barrel length.
Technically speaking an AR upper is NOT a firearm... only the lower is. If I own 1 lower and 1 upper then an arguement can be made (by CFC maybe) that the upper is part of the firearm and modifying the upper but cutting or sawing is therefore modifying the firearm. But if I own more than 1 upper... if my 20" upper that came with my AR stays on my AR and I buy another upper and then modify that upper by dissassembing it to individual pieces and have the barrel modified by a gunsmith. If that barrel is shortened to 7" or 10.5" or 14.5" (whatever) and the upper reassembled and that new shorter upper is then swapped with the 20" upper and I sell my 20" upper and re-register my AR as a shorter barrel length... have I actually contravened the law in technical terms?
The response/opinion of CFC and RCMP (in past) has been that the above constituted a legal change to the firearm through installation of either factory available or commercially manufactered parts and was NOT considered the creation of a "Prohibited" firearm.
The precedent exists to legally make the barrel reduction change... the only question is what steps are necessary to comply with the law. Clearly if an individual buys an AR, takes it home, cuts a chunk off the barrel and the end result is a barrel under 457mm then you'll probably be guilty of creating a "Prohibited" firearm. But if you buy a short barrel upper and exchange it... or if you have a commercial entity "professionally" shorten the barrel then that has been accepted by CFC as legal.
The real issue is who exactly is "accepted" by CFC/RCMP as being allowed to legally shorten a barrel. The law doesn't actually state that I can't "cut" my barrel, it states that I can't cut, saw or alter my firearm if it results in...
If the barrel isn't in the firearm... technically am I cutting or sawing the firearm? If the firearm is changed to a "receiver/frame only" registration... then can I cut or saw the barrel... and once work is completed re-register the frame only to the new "shorter" description?
Can I take my barrel out of the gun... modify my barrel and sell it to you and you then put it in your gun? Is that okay?
The law is so unclear on all of this... and there is so much history of CFC/RCMP accepting changed descriptions (on AR's) with reduced barrel lengths... that I can't imagine any court upholding that portion of the legislation except in the most blatant cases of "sawed off shotgun" type scenarios. BUT... having said that... personally, if I was an individual and wanted to shorten an AR upper that I had I would
NOT do it myself, at home with a saw... I would remove the upper half and have a gunsmith do it professionally. That would give me strong legal basis to argue any "charges" that any authority might contemplate bringing later. The work was commercially done, legally registered (don't foregt to send in the change of description and ask for a revised certificate). Always PYA.
Mark