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m&p15 sport buffer pin

  1. Buffer & Pin issues. Please help!

    M&P 15
    First off, I am new to AR rifles. I bought the M&P 15 sport 5.56 and haven't even fired it yet. The buffer retention pin fell out and logged itself between the hammer and the lower frame. I removed the hammer to get the pin out and reinstalled both. After a few dry cycles the pin and spring fell...