AW,
Straight from the criminal code of Canada:
(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,
You can check it if you dont beleive me:
http://laws.justice.gc.ca/en/c-46/41775.html
Straight from the Canadian firearms center:
Definition of a Prohibited Firearm
The Criminal Code states that a prohibited firearm is:
A rifle or shotgun that has been changed to make it 660 mm or more in overall length, with a barrel less than 457 mm in length;
Check it:
http://www.cfc-ccaf.gc.ca/en/owners_use ... ts/r&p.asp