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Go to home depot and you can make a pipe shotgun that doesn't even require welding to make. A lot of fully 3d printed guns are 9mm. If you havent shot both cartridges I cannot explain the difference between 9mm and a shotgun slug. Maybe it will suffice to say the bulletproof vests that stop 9mm, when hit with a shotgun slug often result in broken ribs, punctured lungs, and general chest cave ins. Your 3d printed gun will undoubtedly have better rate of fire but in terms of accuracy and level of destruction, the shotgun will compete just fine.
Also the 3d printed gun will probably be of questionable durability, and if you think ya can have a 3d printed barrel id love to see ya fire it more than once.
No they use metal barrels but people figured out how to ECM rifle them at home too.
I know, but some people are ignorant of the material sciences and think plastic can be used for the barrel.