I can understand the govermental concerns and questions I have are: 1) If such a gun was used in a crime, would bullet rifeling patterns be usable to tie up th

I can understand the govermental concerns and questions I have are: 1) If such a gun was used in a crime, would bullet rifeling patterns be usable to tie up the shot fired to the plastic barrel gun and let alone the ability to dispose of said gun with a simple lighter. 2) Concerns about it only having a metal firing pin and with that how hard would it be to use say another material for the firing pin like graphite or a the like - only needs to fire one shot I also understand why this project was done, it was a challange and we like challanges. But as other have said, it is a simple type of gun that is the form that can be made by anybody wishing to make such a zip gun, still need ammunition. What the concerns are is they have created a form of weapon that can be produced as easily as a photograph and that is just the tip of the concerns. I will say that personaly whilst making a printable gun was something that was going to happen, giving out the blueprints for anybody to use and abuse was perhaps akin to writing expliot code and releaseing into the wild for any script kiddy to use and abuse with there click-run mentality. The sad part is that people pushing out such blueprints for such printers will only mean that down the line such printers will get taxed and curtailed and effect those who mean no harm and the type of people who given a nuke button infron of them would resist in pressing it as they know the concequences. As soon as a crime is commited with such a gun they will be banned and the 3d printer market will get more controled by legislation. Which is sad when such vigor is not bestowed upon normal guns. Facts are guns do bad things in bad hands so the net result is they are outlawed in many countries and championed as rights in others. So if anything this highlights the issue with guns and not 3D printers, though I suspect the Rifle associations of the World will not defend 3D printers if they start to be restricted over this issue. As an aside nukes are illegal, yet if somebody posted blueprints to make one, well that would pan out badly. Yet on some level this is just the same. I applaud that somebody did and proved it was viable, I'm personaly not happy they gave out the blueprints in a form that enable people who do not understand the issues free access to them. Most will be good people, but not all and that is the crux of concerns however you look at them. So with that this is akin to releaseing 0-day expliot code into the wild in a point and click form.