It's important to note that the USA also has some of the fiercest opponents of private gun ownership in the world.

The most important thing to note here is that a majority of the support for gun control in America is cultural. Even the loud-and-proud pro-gun people got extremely shy about their own principles once the Black Panthers started packing heat. On the flipside, it's also not hard to find gun control supporting Democrats that happen to own firearms in their house. There's a related cultural argument over "assault weapons", or "black guns" - i.e. the ones that look like military weapons rather than hunting tools.

The result of all this confusion - and, for that matter, any culture war fight - is a lot of stupid lawmaking designed specifically to work around the edges of 2A while ignoring how guns actually work or how gun laws are normally written. Like, a while back there were bans on purely cosmetic features of guns. Things like rail attachments, that do not meaningfully increase the lethality of the weapon, but happen to be preferred by a certain crowd of masculinity-challenged right-wingers. In other words, a ban on scary-looking guns.

What's going on here is that someone figured out how to make a 3D printed gun that will not immediately explode in your hand on first firing. In the US it's legal to manufacture your own guns, and there's no requirement to serial-number such a gun, which makes it more difficult to trace if that gun is used to commit a crime. You can't really stop someone from making such a "ghost gun" (practically, not legally), so they want to take a page out of the DMCA 1201 playbook and just ban all the tools used to make such a thing possible.

Personally, I don't think that will pass constitutional muster - but that also relies heavily on existing culture-war brained nonsense that happens to be standing constitutional principle. 2A itself can be interpreted in all sorts of different ways. The original interpretation was "no interfering with state-run slave catching militias", and then later that turned into "everyone has the right to own firearms". Nothing stops it from changing again.