Apparently the ATF doesn't let Canadians ship stocks to the US without having an ATF form 6. Stuart can send you a template, and help get it filled out enough to pass. Then you submit it. I think it took a few days to get back, then forwarded to Stuart, so he can ship legally.

Stuart (Wildcat Composites) was great to deal with, the stock was very stiff, very high quality, very light, it just takes some finish work. I was very impressed with his stock, I'm sure I'll order another one