RPGs and related matters, by Craig Oxbrow.
This has been around for a while now. It's impressive, but they are only printing a particular piece, and you still have to get or buy the rest (plastic barrels are a bad thing in a gun, as someone comments there). And there are cheaper and more effective ways to get, or produce, the part that was printed.http://johnbearross.blogspot.com/2012/07/you-cant-stop-signal-part-2-3-d-printed.html (Not my blog, but useful information on the topic.)
.. Promise? :/
Yeah. It's like the rest of the "rapid prototyping will change the world!!!! Next week!!!!!!!!!" predictions. Yes, the technology can do a lot of cool fabrication. You can make a cellphone case, but you can't make a cellphone, there are too many parts that require specialized fabrication. Your typical gun nut + maker geek can uSe this to make a part of a gun, and use that part to make a fully automatic weapon. But, the same geek could do that 10 years ago with a C&C machining mill, and could set that up cheaper and easier today than they can a prototyper. The only reason this is news is because they are using a 3d printer to produce it, which brings in the "see, I knew the Internet was evil!" advertising dollars.