The Liberator pistol was and is an interesting idea. A simple single-shot firearm in the spirit of the FP-45 Liberator — the American-made holdout pistol designed to be dispersed across Axis-occupied Europe during World War II — the Defense Distributed Liberator is considered to be the first entirely 3D-printed handgun.It’s both a thought experiment and a type of protest: governments can’t control the manufacture of arms, there’s no way to monopolize them.By turning to 3D printing, Defense Distributed, led by Cody Wilson, the Liberator shows that the ability for the general public to manufacture arms and to share their blueprints is...