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  1. MP Full Size Pistols
    HI Everyone, New member here....can't find any online help with my issue: could some of you please assist? I've had a 5" M&P CORE for 2 years...VERY happy with it. However, I just got an Octane 9 suppressor and a Storm Lake threaded barrel, and now the CORE seizes up and won't cycle after 1 or...
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