I would not be surprised at how motivated a gang member is to acquire a firearm, no. So, I guess point taken, however a) I was responding to a claim that's slightly different from 3D printing lower receivers, and b) I thought YouTube banned/got rid of content that actually taught you how to do this? I have not looked in a long time. In any case, milling out a block of material on your own to function as a lower is going to take a lot of time and skill, so my original point still stands.

Separately, I am always a little confused by the idea that you cannot "trace" these firearms. Maybe people do not widely understand what's going on here, but the serial number being traced is on this lower receiver, which can be swapped out (in most but not all cases). If a firearm with a 3D printed lower is used in a crime, I have to assume - though I am not an expert - that you could still connect spent casings to that weapon in the same manner. In other words, it does not matter that the lower doesn't have a factory-installed serial number plate or a stamped serial number. My guess is that this confusion is being injected intentionally in the debate by the people who support/push these badly constructed laws.