Yes, while their opinion is not the law, In this case it is their conclusion that the Beowolf mags are not not manufactured as 50 cal Beowolf mags, but rather a 5.56 mags labeled to fit 50 cal Beowolf rounds, all it take is one look from the top and you can see the half contour of a 5.56 bullet and casing in the plastic follower for stacking the skinnier round, some of the older follower even had 5.56 stamped into the follower!
RCMP overlooked the Beowolf mags in the begining, because it was just a handful for people, but once Youtube videos start popping up telling everybody how wonderful these mags are and companies started to make them in quantities, than news reporters start writing new articles about it, It pretty much forced the RCMP do something.