Actually...
Ammo is not prohibited to bring back from the US. There are restrictions as to how much you can bring, but it's a pretty ridiculous amount. I use to do it all the time when I lived in Ontario.
As for rifle stocks, you can and I have. Didn't get any hassle whatsoever on the US side, but when I came back into Canada they wanted to see my PAL eventhough technically you don't need one to buy a stock. But whatever, it was easier to show it to them then argue technicalities.
Prophet River does sell Bell and Carlson. Stocks. I ordered one and was very happy with their service. Might seem like a long time to wait, but in the end its worth it to get what you're looking for. They also come for sale on here and the E&E on Canadingunnutz quite frequently.
Optics are a different story from what I understand. But you would have to look into that further as I don't have much experience with that.
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