The left is freaking out about 3d printed plastic guns. They think it takes a 3d printer and or some other sophisticated level of tooling to manufacture a gun. That's funny because my dad takes about making "zip guns" when he was a kid in the 1950s. I'm pretty sure 3d printers weren't around then and I don't think he and his friends had access to a machine shop or gun smith's tools. Hell mikhail kalashnikov used a rail yard machine shop to build his AK-47 prototypes. They are also freaking out about 3d printed plastic magazines. You can't 3d print the springs. Mostly plastic magazines have been around for at least 20 years. Let's explore improvised fire arms. With out 3d printing or advanced or specific gun smiting tools. BUT before that the legal aspects. It's legal in most states to build your own fire arm as long as its in compliance with the National fire arms act. I seem to recall reading something about pistols made with less than 2.5 ounces of metal are illegal to sell, I'm going to assume that means manufacturer for your self too, so probably not a good idea to go there. Selling a home made fire arm is definitely illegal. Just remember this followed by 5 to 10 years of this if you break the law. Remember you are probably the one on bottom and if you do happen to be the biggest and baddest on the block I for one don't see much appeal to being on top.