The people who are retiring to foreign countries are obviously not gun owners, because the United States is the only place left in the world that does not border-to-border draconian restrictions on the ownership of firearms (blue states excepted).
So I say let all of them go live in foreign countries. It will make more room for the rest of us to build shooting ranges, and we won't have a bunch of gun haters whining about the noise!:>)
Several Muslim countries allow gun onwership and in some carrying them aroung (including AKs).