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Surprisingly, 3D printing is where most of the firearm innovation is happening now. Some use off the shelf parts from common guns like the AR-15, others are completely printed. It's a weird rabbit hole to fall into, but definitely interesting.
The "should this be legal/illegal" debate is its own rabbit hole as well.
It always struck me as weird that serial numbers and therefore the weapons tie to the owner are printed on the receiver. A receiver can be milled with a simple CNC mill or as recent development shown using 3D printers. We should rather serialize and register barrels, the one thing that needs highly specialized equipment to manufacture and what defines the guns caliber, potential muzzle velocity and has unique thread profile.