Eh, sounds kinda reasonable. Ammo already has unique serial numbers embedded in the butt of every cartridge (in some countries, not sure about the US), and guns do leave somewhat unique marks on the bullets upon firing so... sure, why not. Surprised it took that long TBF, the necessary technology has been commercially available since the early 90s, I think?
> 3D printers should have a magical algorithm to recognize all gun parts in their tiny embedded systems
Yeah, this one's seems unnecessary. Is weapon manufacturing without a license a crime? If yes, then whoever 3D-prints a gun can be prosecuted normally.
> Now, you need to verify your age... on your microwave?
Or on your gas stove. A travesty, really: I was taught how to operate a stove when I was in the second grade and never burned any houses down, thank you very much.