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.
Is it that easy to acquire even illegal firearms in the US, that you can just walk around in NYC to the shadier streets and find randoms willing to sell them to you?
However, you really don't even need to do that. You could just drive across the NY border to a state with looser gun laws, buy one there, shave off the serial number, and bring it back to NY. You could also just steal a gun from one of the many Americans who already own one.
You can also legally buy an unfinished lower receiver in many states (the part of a gun that is typically serialized). Since it's technically unfinished, it doesn't require a serial number. Then you drill a few holes into it and assemble it with off the shelf, also un-serialized gun parts.