I had them sent to an address in a U.S. border town, drove across and picked them up. I told them what the purpose of my visit was at the border, they looked it up in some book and said I was fine. When I brought them back the lady on the Canadian side thought that they were over capacity magazines and should be pinned to 5 rounds. After I explained that the rule didn't apply to 22lr she took my word for it and didn't even charge the tax.
However the the mags kind of suck and will jam if you load more than 15 rounds, but they look cool.