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  1. Default 300BK conversion help

    Gonna change a low-mileage DPMS AR-15 to 300BK. Barrel and block on its way...I have the wrench.

    A friend told me I have to change the buffer spring. But I can't find confirmation anywhere. Opinions or experience?

    Any good subsonic load recipes?


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    Carbine length.

  2. #2


    The standard carbine spring and buffer should get you started. I used a H2 buffer in my first attempt, but changed the buffer to a standard buffer after the rifle was not 100% reliable. It operates well with the standard buffer and spring. I have several 16" barreled .300 BLK carbines, with pistol length gas systems, that work with the standard springs and buffers.
    Last edited by gwp; 02-13-2018 at 03:35.

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