How billet AR-15 receivers are made

    SI Defense manufactures AR-15 lower and upper receivers that are machined out of solid aluminum billet blocks.

    Picture 12-21
    Two soon-to-be receivers being sprayed with coolant by the CNC machine

    They have photos of the process and a video showing the CNC machine in operation. Very interesting.

    Thanks to Health for the link.

    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!