Edit, reading further it's even more insane:
> The New York definitions sweep in not just FDM and resin printers, but also CNC mills and “any machine capable of making three-dimensional modifications to an object from a digital design file using subtractive manufacturing.” That’s a lot of shop & manufacturing equipment!
This is the dumbest thing I have ever read.
What are you referring to as "it" here? When OP mentioned getting a gun from "off the street", that's referring to obtaining one illegally, without a provenance chain or any permitting.
If you want to shoot a CEO, its far easier to buy an untraceable gun on the streets (or obtain a non-serialized 80% lower receiver that you drill yourself) rather than an unreliable fully 3D-printed gun.