I have had this first hand. I pitted mine against a rental gun. Both FS 9...I bought mine after two 150 round sessions at the range with the rental gun. Then I bought mine and could never shoot it to the tune of the rental. I bought sights, sight tool, and even got new glasses...no <deleted>!! After 18+ month of screwing arounf I decided to go back and rent the gun that sold me on the M&P to begin with! So I did a test and rented the gun once again as well as took mine in to shoot side by side. I put 50 round thru each. 21', 30', 45', 60', and 75' (I Suck at anything past 45' but still..I was much better on the rental gun then my own). Same targets, same ammo, etc. The results pissed me off! My gun is not nearly as accurate as the rental. I was having a ton of issues with mine past 15 yards!!! Even closer I had almost no flyers on the rental...group was tighter and so on! This little test was the only way to get closure on how I was shooting! The insult to this is the rental gun has a significant amount of rounds on it I am sure...not to mention a broken slide release on the right side. Mine has an APEX trigger as well. I am a little pissed and do not know how to address this with smith. In general most of the M&P I have seen are a little lose...maybe mine is more so...but man does this piss me off and burn my ass!
Now I need to convince S&W of this. I could do it again and provide targets but this is getting expensive and more so inconvenient! I might see if I kept this target to send to smith...but who knows if this matters. I which I knew where to measure for tolerances on this gun. Might help but at this point I am a little burned and more then pissed! I have over 1300 round thru mine gun. So I dont really think it is me or the gun. The side by side comparison helped me understand it was not me after all. I am considering dumping it for a PPQ as I have told others. I shoot it much better and like the trigger even more on the PPQ. I am considering selling it but I have soooo much into this M&P, holster for IDPA, 6 mags, mag holster, APEX trigger, different sights (the original factory ones are back on it...and where for the side by side test). I planned on doing some IDPA but after getting my gun I questioned if I would do well. I did substantially better with the rental gun. I do tend to shoot a ton of different guns but overall have shoot mine more then the other and when you factor in all the rounds I have put thru an M&P9 it is approaching 2k...I think I have an idea of what the gun with do!
I have to date shot an XDm 9, Px4, P30, 24/7 G2, PPQ, Baby Eagle, P250, P226, 92FS, CZ 75b, and a few others. All in 9mm and all with a minimum of 100 rounds...a good chunk of them with over 250 rounds or more. I settled on the M&P after a factory shoot some years ago. I tested many leading up to my purchase and skipped the M&P. That is when I read up on it and went back and rented it. First time (150 rounds) I was very good and impressed with what I could do with it. I was actually going to buy a Px4 storm...the one my buddies has that we shoot together on a regular basis along with an XDm. The three of us and a forth shoot at least once a month in the winter and then it is off to shotguns for clays in spring and fall... occasionally in the summer in doors when it is to hot we do a few times on the pistols on the summer. All in all a lot of time on a pistol. Of all the gun at the time leading up to my purchase the M&P after (2) 150 round session at the range...I shot it better than everything I had shot prior. Now with that said I didnt at the time have any experience with the CZ 75, Baby Eagle, 24/7, P30 or PPQ. I now shoot the Baby Eagle in either polymer or all steel better than any other gun I have ever shot in my life! It is a longer barrel and based on the CZ which is considered extremely accurate but still I was no slouch on the M&P rental. All in all this might help explain something that the tolerances are not perfect and my experience now and testing have helped me draw a better conclusion. I was at a lose for words...there is an issue with this gun...I dont believe it is the shooter...I took someone with me as well to help me make sure I wasnt nuts when I did the side by side. He shot as well with his own ammo but is not an M&P shooter to begin with so I did not pay attention to his results for he was all over the map with both! I will say I am not the best shooter but I have been far better on other guns as well as other M&P9. This I believe is a tolerance issue in manufacturing.