Something with lockup. I am still on the fence about a 9fs I have possibly having this issue. 1 out of 5 rounds tends to fly out of whack. 25 yards really noticeable. 10 yards, not so much. My pro & compact do not exhibit this behavior.
I was making a fist size pattern at 25 yards the other day with my Glock 26.
I know this thread is about the M&P 9FS, but I just wanted to brag a little
Yep. Just changed some of their barrel twists recently. There were well documented reports of terrible accuracy out past 15y or so. M4c has some decent threads with info - looks like they have it under control? Mags are still stupid hard to find in FS
Current production S&W M&P's (Update)
I do not own any MP series, so I can't comment on anything but dry fire, and .. eh.
I'd love to try a FS, but I'm looking for out of the box reliability - I think the parts for both glocks and m&p should have been dealt with in house, and apex, well.. it shouldn't be necessary.
I have the early models and I do noticed that the triggers were gritty, with use it becomes smooth. Mine's accurate, I'm not.
Apex parts aren't necessary. It's just that those of us who cut our teeth on Glocks came to prefer a certain kind of feel. A box stock M&P will run just fine.