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How are gun laws in Washington? NFA items??
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Generally not terrible gun laws. Permitless open carry is fine with the usual caveats about getting LEO attention in the bigger cities. Full auto and short barrel shotguns are illegal.
Concealed pistol license is shall-issue for residents and may-issue for non residents. Idaho doesn't require a permit for residents and recognizes Washington's, and Washington recognizes Idaho's *enhanced* resident permit, so from that perspective you can live wherever you want.
If you have dealings in Oregon, be aware that Oregon doesn't recognize any other state's permit and is may-issue for people who live in WA, ID, NV and CA. In my limited experience Multnomah county sheriff is very willing to issue to non residents.