Defense Distributed fires 600 rounds from a 3D printed AR lower.

You may remember my earlier post regarding Defense Distributed, the group behind the Wiki Weapon project. So far, Defense Distributed has successfully produced magazines and AR lowers using 3D printers. However, until now, their lower could only fire several rounds before it shattered. Their newest edition is much more capable, and has been tested to over 600 rounds!

To most people, this is not a major accomplishment, since the lower receiver is only one part of the firearm. However, it is the most important part, since AR-15 lowers are the only part of the weapons that are actually legally considered a "firearm". The lower is the only part that is registered and serial-numbered. Therefore, by 3D printing a lower, one can create a gun which is not "in the system". Defense distributed has a video, as well as many other interesting photos of their magazines and guns on their blog.