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  1. #1
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    Jul 2013
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    M4 buffer Spring T&E

    The rifle is a DDM4 with an Azimuth BCG, JP gas-ring (1 piece), and carbine RE. The gas-port was pin gauged at between 0.0735" and 0.0745". There is roughly 5,000 rounds on this rifle, with about half of it on the Azimuth BCG. A Colt mil-spec ejector spring was used, and a SAW/Ken Elmore "Green" extractor spring with black mil-spec buffer and no O-ring was used. The suppressor depicted is a Surefire 556-212. Ammunition used was .223 Bronze 55gr for unsuppressed videos, and PMC XTAC M193 55gr 5.56 for suppressed videos. The same H2 buffer was used for all videos, with the exception of the Geissele Super 42 videos, which used the included Geissele buffer, re-configured by me, to H2 weight, with the spare weight Geissele offers for it.

    https://www.youtube.com/watch?v=utg9gPFrHOE
    https://www.youtube.com/watch?v=Lk6KshcVD4Q
    Tubb 17-7 Flatwire Spring

    https://www.youtube.com/watch?v=5mbgrK9VUQc
    https://www.youtube.com/watch?v=IOddT0Ak6UA
    Sprinco "Blue" spring

    https://www.youtube.com/watch?v=pQIs-qcwpKs
    https://www.youtube.com/watch?v=9dpNir_G_fQ
    Geissele Super 42

    https://www.youtube.com/watch?v=KwssoYuN40M
    https://www.youtube.com/watch?v=EDd9I-bmTSM
    JP Polished/Tuned

    https://www.youtube.com/watch?v=dhblpS5s0sc
    https://www.youtube.com/watch?v=HBsgG9-AKpE
    Mil-Spec

    From L to R, as pictured

    Tubb Flatwire, Mil-Spec Rifle (not used in evaluation, as this was done with a carbine RE, shown for scale), JP tuned/polished, Sprinco "Blue", Geissele Super 42, Mil-Spec
    Last edited by JGifford; 30 June 2016 at 21:14.

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