It's not "enforcing" that is the problem in this case, it's "interpreting" that is the issue. One can interpret just about any statement to mean anything. In this case, by choosing not to follow Section 84 of the Criminal Code in a clear cut manner (ie. 5 rounds MAX for the magazine's intended calibre and manufacture - which was clearly in this case to be .50 Beowulf), they're really opening a can of worms by creating this "dual use" term. Any magazine that can hold different calibres is in touble of being forced into only accepting the lowest number of cartridges possible. It will only take one judge and one verdict for the RCMP to turn Section 84 of the criminal code upside down and force all gun owners in Canada to move their rivets up even further. I doubt even the RCMP would want to see the re-percussions of that outcome. They'll immediately piss off a couple million people (at the least), and they'll be causing a huge headache for the provinces and their hunting regs.