First off, Guys, I am a LEO armorer. And I am a S&W certified M&P armorer, as well. If you know what to look for, it easy to tell which gun is which. As far as checking before I took delivery, I did. 2 things about that. I did a cursory look at the trigger bar before I took delivery and I swore I saw the letter "H". I guess I am blind because it is the letter "S" instead. And I also was of the information that ALL M&P's in the last 1 1/2 - 2 years were the "H" model upgrade, so I assumed that's what I would get. The kicker to this is the "Build" date on this pistol is 11/03/2015. This pistol should have all the updates that S&W started to do to M&P's in 2013. I will absolutely return this pistol to S&W with a letter from me asking what has happened, and a request to fully upgrade the pistol to the new specification. I have a idea on how this happened, but it's a full tilt WAG on my part, and I won't go into it.
As far as how it shoots? Very probably just fine, but I will not bust a cap thru it until it is what it is supposed to be, or failing an upgrade, selling it.
My duty M&P was made in 2008 and it's fine. It has an APEX RAM in it and it rocks along. But it's a .40 and this new M&P is in 9mm.
BtW, A person cannot use an APEX RAM in an M&P that has the thumb safety sear block. No where to install it as S&W changed the sear block to accommodate the thumb safety itself.
Anyway, I will advise further when I know anything. Thanx, Guys.