Imagine that there was another revolution. And that nothing big had changed. Demographics, power dynamics, culture, our economic system and political values were pretty much the same as they are now. If we Americans rolled up our sleeves and reimagined our political system from scratch, if we wrote up a brand-new constitution for 2017, what would a brand-spanking-new United States Version 2.0 look like today?
A lot of stuff would be different. Like, there wouldn't be an electoral college. (Only a handful of countries, mainly autocracies in the developing world, do.)
There probably wouldn't be a Second Amendment; if there were, it would certainly be limited to the right to own pistols and hunting weapons. And the vast majority of gun owners believe in regulations like background checks.