What If US Gun Owners Fought NATO?

What If American Gun Owners Fought NATO? There are about 500 million privately owned firearms in the United States, and this time they're not facing one army. They're facing every country in NATO except the US, all at once. Why the alliance turns on its founding member doesn't matter here... we're going full sandbox. The US government and military are switched off completely, so the only people defending the country are civilians who already legally own a gun. One more rule: the UK and France both have nuclear weapons. For this scenario, they stay locked up. Let's go! Made by my Last Brain Cell