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While 3d printers are getting more attention, what will likely have more of an impact on 'home built' firearms is the proliferation of inexpensive CNC milling machines, because in the long run they accomplish the same thing as a printer, but with much more practical results.
Consider-with a fairly small CNC mill, a downloaded set of instructions and a small block of aluminum, one can make the frame of a REAL 1911; a gun that will last a lifetime, and be effective as any store bought weapon. That will change the game far more than the small, extremely limited weapons that could be made of the additive plastics available for printing today.
Lrry
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