Hell, you can make a basic pipe shotgun with a $5 hacksaw and some steel pipe. Not only that, but you can pretty convert tons of guns to full auto with basically no effort. Sometimes literally a piece of coat hanger bent with pliers. The Lightning Link, which can convert a majority of modern ARs to full auto has been around for decades and can be made with about $1 worth of steel, a piece of paper with the design printed on it, and that hacksaw you used earlier. Even some guy in his garage could easily make hundreds a year without a single power tool.

All of this is to say, you know what we don't see? Millions of illegal full-auto firearms being used to re-enact the minigun scene from Terminator 2. Much to the shock of our government, the vast majority of citizens are law-abiding, and stupid shit like this once again only harms normal people while criminals will just continue to break the law as usual.