unintended

  1. C

    unintended auto fire from new 5.7 upper

    Wondered if others had this issue with the 5.7 uppers? I bought a new 5.7 upper and mounted it on a 5.56 DPMS lower- Using FN blue box ammo, the first two trigger pulls sent single rounds down range without any issue. However, the next trigger pull fired a four round burst-Necks of the cases...
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