The short version, is that the Canadian antique regs for rifles state a firearm has to be manufactured before 1898, be a rimfire (but not .22), or be centerfire with a bore exceeding 8.3mm. Then there is a confusing part about if magazine-fed rifles are excempt from the bore requirement or are simply NEVER eligible for antique status.
So, the AK47 will never have been manufactured before 1898, so will never be antique.
The AK-47, in 7.62x39 will never have a bore exceeding 8.3 mm, so will never be antique.
Then, the confusing part (for me) - the AK is magazine-fed, so it won't be antique regardless of any of the other criteria, OR, it is excempt from the 8.3mm bore requirement. But since it failed the first criterion (manufactured before 1898) it still won't ever be antique.
Unfortunately, the date part (1898) is never updated in Canada. The reg. doesn't say "100 years old" for example, which would have put that date up to 1915 by now. Instead, it casts the year 1898 in stone, so none of the newer stuff will ever be antique.
That is my understanding, anyway.
Plus, there are those pesky full-auto issues too for some of them.
And further - can a firearm that is a prescribed prohibited firearm ever be in any other classification (such as antique)? Somehow I suspect the answer to that is also "no" but I don't know for sure. I don't believe there is currently any example of a prohib. by Order-In-Council that could meet the antique provisions, so there isn't any law saying which takes precedence. Usually, the more restrictive law takes precedence, so again, the AK is unlikely to be antique.
Just my thoughts.