I doubt there are any in Canada in private hands. I had one years ago, it was an ex-police trial gun, had a lot of rounds through it, it was serial #3. Took me two days to clean it, it was so filthy. I also had another one that was deactivated, it had been used as a prop gun in movies.
There have been a lot of variations of the AUG-9.
Originally it was a conversion kit, then they improved it, then they starting making a bespoke carbine. Most of the differences between the models are in the magazine well. Early models had the ramp on the mag well adapter, on the bespoke one (later on, not on the first ones) they redesigned the receiver with the ramp on the receiver to improve reliability.
The mags are easier to change on the 9mm version because of the location of the catch on the mag well adapter. However the assembly itself is a big chunk of metal and it made the rifle butt-heavy. Because you lose barrel length upfront as well that made the gun very butt-heavy.
Also it uses the MPi-81 magazines, which are also made of metal and that makes it even heavier, plus 9mm rounds have a heavier bullet, so it's heavier still. Basically - very butt heavy.
Shame ####ty trigger pull obviously. The bespoke AUG-9 had a different reticle on the scope that was more suited to shooting 9mm, it was just a circle, no dot or cross in the middle. It also had angled cuts in the barrel to work as a compensator. It also had a ridge around the ejection port. This is one of the guns I had:
