If there is one thing gangs have proven, its guns and ammo will always be available even if outlawed. Most interesting is take the Glock non metal gun to the next step, soon you will be able to 3D print sophisticated weapons and even ammo. Single shot Derringer type pistols can be 3d printed today by any high school kid, as someone who worked in the public schools a few years ago i saw it first hand, not the ammo but a functioning single shot pistol