Just the lower receiver was made with the 3D printer, these are usually made from aluminum forgings which are then machined. The lower still requires a Lower Parts Kit including the fire control group [trigger, disconnector, hammer, etc] and many pins, springs, detents, and proprietary parts all made from metal to operate. The lower receiver is the only registered part of the firearm and "stripped" lowers [lowers with no parts in them yet] are regularly sold for about $100-150 with a background check just like one would perform for a complete firearm.
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