Bogie, come on this is Canada, not the USA, where with the right cross checks and licencing, one good US citizen may own a full auto depending on the state you live in.
(unless you are grandfathered as a "bona fide" collector of full automatic firearms in Canada/licenced since 1977-78 or so)
I find it surprizing you do not know this basic law here?
I regards to fastest firing semi auto rifles:
The only reason I purchased a Ruger 10/22 in South Saskatchewan was that it took alot more firing of ammo (500-700) rds before it would hick-up and require cleaning.
For the most part too, all this usually entailed was a spray with WD-40 or automotive brake cleaner, and I was good to go for another 200 rounds or so.
My older but still fun Winchester 490 required cleaning every 400 rounds or so.
Oh by the way when the 490 was clean, it was just as fast firing as the 10/22!
Why? Bill Ruger knew firearm design, the surface area on a 10/22 is much bigger.
Takes alot more carbon build up to slow it down.