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[dairydog91]

125. If the technology gets cheap enough, you can't.

Kind of like how the War on Pot has been an ignominious failure. It's just too damn easy and cheap to make some more weed. Sure, people will howl about raising sentences, and police will parade drug dealers around on television, but in the end the prohibition campaign has and will continue to fail. If a crime is super cheap to commit, lots of people want to commit it, and they can commit that crime in private, then lots of people will commit that crime AND most will get away with it.

high capacity clips
The spring is about the only sophisticated part in a typical magazine. Once you have that, the rest of the magazine is just a simple box. 3d printers only make the task of making that box slightly easier, since you could already make magazines out of sheet metal with a basic shop.

full-auto conversion kits
Which are related to 3d printers how? Machinegun parts are machined out of metal; they have to be built tough to withstand prolonged, intense heat and rapid mechanical action. You're not going to be printing them out of plastic anytime soon. However, you could use a basic metalshop to make simple machineguns like Stens.