[noxer]

You can make bullets yourself just like you can make the gun. You may remember the assassination of Shinzo Abe.

In the US low powerd black powder is super easy to get you don't even have to take fireworks apart or do home lab chemicals stuff.

[codedokode]

But you need something better than a 3D printer for bullets. So if bullet sales are regulated, there is no need to regulate 3D printing.

[richwater]

Making bullets is trivial. It's black powder, a case of metal (brass, aluminum, etc), and some molten lead.

This doesn't even address the constitutional right. You can't ban the printing press and claim it doesn't affect the freedom of speech.

[Findecanor]

How about blasting caps? Those are integrated into modern brass cartridges, and I think making them that way would require more precision than you'd be able to achieve with simple hand tools and an anvil.

19th century revolvers tended to require separate blasting caps, but you still had to buy them even if you could make the bullets.

[elictronic]

Tiny objects are harder to regulate. Many drugs are illegal but are still easily accessible due to their small size and transportability.

The correct action at this point in a society that wanted to keep guns legal but better regulated would be regulation of barrels. They are the only item left that are truly difficult to make in quantity and hide easily.

[parineum]

Shotguns don't need rifling.

[bigfatkitten]

Electronic firing is an option. It’s well proven on aircraft autocannons.

[noxer]

Aside form high powered stuff you can get away with pure lead bullet.

See https://news.ycombinator.com/item?id=47771707 for the rest.

[dlcarrier]

You can re-use the shells, so all you need to do is cast the bullet, which is really easy, then load the gunpowder into the shells and use a simple machine to crimp the bullet on, and you're done. There's lots of off-the-shelf hardware to do it that is pretty common throughout the US.

[AngryData]

Many people already load and reload their own bullets in the US because it is significantly cheaper. Good brass can be used many times over and loading equipment consists of an arbor press and some dies. Regulation would make getting it harder and more expensive, but all you would be doing is creating an ammunition black market that funds criminal enterprise with a supply still too large to do much in hampering gun crime.

Responsible gun owners and hunter who practice regularly would be harmed the most because they use tons of ammo. Criminals won't because they might only shoot a few bullets in their life and usually from close range.

[bigfatkitten]

They do that too, but they still let people buy motor vehicles, with which they can drive to Nevada or Arizona to purchase ammunition.