Link to article covering the amendment
Relevant bit:
(g) a firearm that is a rifle or shotgun, that is capable of discharging centre-fire ammunition in a semi-automatic manner and that is designed to accept a detachable cartridge magazine with a capacity greater than five cartridges of the type for which the firearm was originally designed.
Unfortunately, I'm not sure I agree. It's current direction is not the result of failure to achieve objectives but seemingly a quite conscious re-shaping of society into a totalitarian autocracy - all for the good of the Canadian subjects, of course.