Not to encourage this as I am not a lawyer, but mags purchased before the bill was enacted are grandfathered in, meaning that you can still own them, you just can’t buy them. So, if you own any already, you’re likely fine as far as I can tell. I know that some people just go to Idaho to buy them and then they bring them back. Definitely illegal, but mags aren’t tracked in any shape or form so they do it.

The semi automatic rifles themselves, as long as they were registered before the bill passed, were also grandfathered in. I’m not sure if out of state purchases count in that or not, though.

I don’t believe there’s any sort of official “militia”, but the SRA is very active in the region and may qualify as one.