But it's federal law, you need to be a lawful resident of the United States/and of the state you're in to buy/take possession of bought firearms through an FFL. ATF form 4473 literally asks if you're a permanent resident or citizen. If you're visiting the US as a Canadian or living as a "snowbird", NICS would fail your background check given your status.
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u/Cre_AK47 Name Prohibited by OIC 6d ago
How do you pass NICS without any type of green card/citizenship, unless you're going through private sales?