I'm using one in my M&P15T and it performs flawlessly. I can't say if it alone will have any affect on a M&P15's ability to cycle low pressure ammo (Wolf and the like) as I've used precious little of this type of ammo. I also have a M16 bolt carrier installed further increasing reciprocating weight. I have yet to experience a single malfunction of any kind with more than 3,500 rounds downrange. I installed the ST-T2 buffer after the first 1,000 rounds and the F/A bolt carrier after 2,000 or so rounds.
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M&P15T M&P9 M&P9c SW1911 4506
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