Not in some jurisdictions. Know your local laws!

Yes it is 100% legal, I've done it myself. And there are actually single shot pistols you can download and print.

I'm not in anyway in favor of the legislation, just pointing out that machining a functioning anything isn't as easy as you said.

Once the machine is set up yes, they can absolutely do that. That's how they're manufactured for the most part.

But the idea that any untrained, inexperienced person has the ability to physically setup, make jigs, indicate in said jigs, make a cad file, turn it into a cam program, load it into a machine, indicate in the stock, select the correct tooling and set it up, etc, etc, etc... It's a magnitude more difficult than 3d printing, and the machines that do that kind of fully automated work costs in the millions.

Give instructions for toilet paper weapon plz

They're using agentic ai to autonomously program, physically setup and gauge, and then run parts? Where are they doing this and who are "people"?