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Originally Posted by kunkstyle

"Magazines designed to contain centrefire cartridges and designed or manufactured for use in a semiautomatic rifle are limited to five cartridges."

http://www.rcmp-grc.gc.ca/cfp-pcaf/b...323-72-eng.htm

Would the Sig MCX not fall under that?

You're limited to 5 rounds if you use a magazine that was designed for a semi-auto rifle. If you use a magazine not designed for a semi-auto rifle, you're limited to that magazine's legal limit