haha ya I have read a lot of the HiPoint hate on US boards too!
2. Magazines designed or manufactured for both centrefire calibre rifles and handguns
Magazines designed to contain centrefire cartridges and designed or manufactured for use in a semiautomatic rifle are limited to five cartridges. However, magazines designed to contain centrefire cartridges and designed or manufactured for use in a semiautomatic handgun are limited to 10 cartridges. Magazines designed or manufactured for use in both semiautomatic rifles and semiautomatic handguns are subject to the limit of five cartridges.
Example:
Hi-Point rifle and handgun chambered for 9mm Luger caliber:
magazine capacities over five rounds are prohibited.
From what I understand, the Hi Point magazines in 9mm Luger are prohibited if over 5 rounds (as there isn't a 9mm pistol available in Canada). If the magazine is marked .40 pistol (legal to use in the Hi Point .40 carbine) and it happens to fit in the 9mm carbine, would that be good to go?