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Presume you're talking about 10/22 parts. I don't know about a Canadian supplier but Rimfire Sports in the States has them and they ship free to Canada. I've never had any problem with U.S. export laws or Canadian customs when getting stuff from them.
Magazines probably are worth purchasing here in Canada (unless we're talking TI-25 magazines! ), but it depends on your local-area pricing..........all this is assuming you're talking BC steel-lipped mags?
+1 on the bolt release handjob. Piece of cake. I've even seen templates you can print out and trace with a scribe if you're not good freehanding with the file or dremel. Don't waste the 10 bucks.