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it might be interesting to design a printed gun based on a smoothbore steel pipe barrel and teh .410 rifled slug round.
a rifled slug would give you enough accuracy from an off the shelf piece of half-inch ID pipe to make a decent short range weapon with considerable knockdown power.
sounds like a fun project. Base the design on an open breech blowback concept. Kind of like a printed sten gun
not sure what I would use as the breechbock and firing pin.
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