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I'd suggest contacting Gretch if there are OEM parts you want to exchange for what you have. AR7 .com has lots of stuff but I don't know about importing or if they have dealers in Canada.
A member recently dealt with Gretch with a Warranty issue and had good results. I don't know about getting 'parts' for sure, but my best suggestion.
Here's the thread about the Warranty issue, I have both an Original '60s Armalite and now a Henry also. I'd start there with Gretch. https://www.canadiangunnutz.com/for...ifle-AR7-Shoots-16-18-inches-low-at-25-meters