I can't help but reiterate that guns don't kill people, bullets do.
You can 3D print a gun, but without very special and expensive tools one cannot make their own bullets.
An assault rifle is an expensive metal blunt object without rounds.
Ammunition control. Not gun control.
我不得不重申，枪不会杀人，子弹会杀人。
你可以用3D打印枪，但如果没有非常特殊和昂贵的工具，你就无法制作自己的子弹。
突击步枪是一种昂贵的金属钝体，没有子弹。
弹药管制。不是枪支管制。