3D Printer AR Rifle Fail

    The Defense Distributed project tested a AR-15 lower they printed with a upper receiver chambered for 5.7x28mm FN. The 5.7mm cartridge generates a lot less recoil than a full power 5.56mm / .223 round.

    Surprisingly the buffer tube threading held up, but the off axis force of the buffer tube against the ring caused it to fail. There is a write up about the incident at the Wiki Weapon blog.

    [ Many thanks to everyone who sent in this tip. ]

    [Hat Tip: Boing Boing]

    Steve Johnson

    I founded TFB in 2007 and over 10 years worked tirelessly, with the help of my team, to build it up into the largest gun blog online. I retired as Editor in Chief in 2017. During my decade at TFB I was fortunate to work with the most amazing talented writers and genuinely good people!