Michael Thad Carter for ForbesRemember when Defense Distributed's Cody Wilson promised to unveil an entirely 3D-printed handgun made of ABS plastic with the firing pin its only metal part? Well, he's apparently done it. Forbes's Andy Greenberg was given a sneak peek of the result, and it looks and appears to be quite an achievement. If all goes well, the plans will be unveiled at Defcad.org next week.Writes Greenberg: Eight months ago, Cody Wilson set out to create the world’s first entirely 3D-printable handgun.Now he has.Early next week, Wilson, a 25-year University of Texas law student and founder of the...