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KKM for my M&P full size. When I bought my M&P accuracy was poor. But before thoroughly broken in I procured an M&Pc as well and the accuracy was what I am used to. I found out that the lockup on barrels for M&Ps had been a complaint and was being rectified but some older ones had problems.
When I bought the KKM the deviation dropped to about a third of what it was.
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