With all of the hype about 3-D printed guns, I've noticed a surge in interest in constructing your own guns. Not just assembling, but also building a rifle from scratch. The growing interest appears to be centred on making a political statement rather than evading rules. A declaration that the signal cannot be stopped. With a renewed interest in this type of build, I wanted to compile a list of all the guns that can be made from 80 percent receivers. 3-D printing guns is cool, but they aren't particularly good or effective weapons. 3D printers are costly, and the...