content: Out government has literally been handing select fire rifles and anti-aircraft weapons to terrorists since before you were born, and will continue to do it long after we're all dead.  I wouldn't worry too much about it. And yes, within a few years it will be possible to 3-D print weapons as effective and durable as professionally machined ones these days, which sort of makes the whole gun control thing look like an even bigger joke than it already is.