Picked up an M&P Sport 2 a few weeks ago. About 300 rounds in and absolutely in love with it. A couple of inexpensive upgrades that seem to be sweet so far... Magpul handgaurd and a "budget" red dot. This thing is on the money out to 100yards. My only wonder is that the dust cover will not push closed. I have to push the pin down to close it. Do these loosen up over timer time? Thanks!