Proof Research and SI Defense Video

    Four Guys Guns posted this video on their website. I can’t embed the video so here is the link.

    It is a short video showing the manufacturing of Proof Research Barrels and SI Defense receivers.

    Proof Research makes carbon fiber wrapped barrels. Here is a video we posted last year.

    Proof barrels




    SI Defense manufactures AR15s and Ambi AR10s as well as a 300WM AR. Check them out at

    SI Receiver



    Nicholas C

    Steadicam Gun Operator
    Night Vision & Thermal Aficionado
    Flashlight/Laser Enthusiast
    USPSA competitor

    Any questions please email him at [email protected]