The agents provocateur at Defense Distributed welcomed Congress back from recess by releasing a video of a brand new 3-D printed AR-15 receiver being used to fire multiple 100-round magazines. The video, embedded below, features a gun being fired for almost the video's entire 3-minute run time, with both a Fused Deposition Modeling and Stereolithography model (these are different 3-D printing techniques) of the 3-D printed receiver tested. The receiver could have been tested with any magazine, so picking these truly massive 100-round ones, three times the size of those regularly carried by soldiers, is a direct rebuke to Congress, which is currently debating a ban on high-capacity magazines, starting at 30 rounds and possibly going as low as the President's desired limit of 10.