http://gazetteducanada.gc.ca/partI/1998/19980620/html/regle1-e.html
(4) and (5) Part 4 — Prohibited
Devices and Part 5 — Prohibited Ammunition
The class of prohibited devices includes certain components, parts or accessories. These are: trigger devices which allow a semi-automatic firearm to discharge several rounds in rapid succession; and "bull-pup"
stocks which allow rifles and shotguns to be reduced significantly in length. Both of these items are currently prohibited by Prohibited Weapons Order, No. 9