re: If you could choose any European country to live in, would you leave the US to do so?

You can tell all the people that either haven't been to Europe or haven't been in 2 decades. And others that are relying on word of mouth

Look up gun laws in Switzerland. Your automatic weapons are illegal. Large mags are illegal. If you want to bring it out in public, it requires a separate and special permit that is only for those with proven need, like police, private security, or defence. You have to take a test. For non-swiss, there even another permit

All that said. UK or Ireland