If Im not mistaken, certain individuals can have Prohibited Device Licenses and can lawfully use unpinned mags at the ranges. so not everyone is equal and not assume they are breaking the law.
And DrXenon, the frt is only slightly more official than CGN. It is the RCMPs opinion, not the law.
I said only that you would be playing with fire to possess a 10 round mag for an MPX. It is a fact that the MPX is a rifle, and it is so because Sig homologated it that way. That may change for the 8" version, but for now you need to get used to 5 round mags.
No such thing as a prohibited device license for individuals. Businesses yes, individuals no.
And DrXenon, the frt is only slightly more official than CGN. It is the RCMPs opinion, not the law.
You will not that the RCMP dont explain WHY they think its limited to five rounds. They simply state that is. They fail to mention that this limit is based on the presumption that the MPX is a rifle and They seem to omit the possibility that any MPX could ever be considered a pistol, which is clearly false.
You will also note they fail to mention their BS dual use doctrine.
To the OP, if you can eadily unpin a 5 rd mag and repin it to 10, then the mag was never legally pinned in the first place. Fortunately the RCMP seem to not really be bothered with enforcing the magazine nonsense that much.
I know when the guys from Black Leaf built their BL9's that was one thing they were really pushing on, their BL9 is registered on the FRT as a handgun, so you can legally run 10 round Glock mags in them. But should the registry ever change they would never be legally allowed to re-register as NR regardless of barrel length.