I think it would be relatively easy to 3D print a crude one use hand gun. You could have it constructed entirely of a polymer that will stretch rather than fracture under the pressure. Fill it up with some homemade black powder and some buck shot cast from wheel weights and BOOM. Ignite it with a BBQ lighter or something. I guess you could even set up a production line of pre-loaded one use plastic zip guns for nefarious purposes. Totally feasible IMO. As long as you can make projectiles and some form of propellant, it would be pretty much uncontrollable.
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