Assuming what you're saying is true, this is the kind of thing 2A was written for. I don't mean for you personally, but for society it's really the last line of defense against a rogue government. But, even if your story is totally made up it's completely believable. Scary times.
2A might have been written hundreds of years ago but it is now an instrument to sell guns. no amount of guns you buy will help you against rogue government