MrApathy said:some people may make you think so but it is often a human trait than the firearm or ammo. low or low and left(for right handers). rare occasion its the gun or ammo. lemons happen. umc is not the greatest but low a ft is not common with any ammo I have heard of.
get some snap caps and move your target closer. hand a empty magazine to your shooting partnet have them load it with snap caps and live ammo alternating. have the partner watch you while you shoot be sure to watch yourself and the target.
Well said. Most issues can be traced to operator error in firearms.
Low by 12" MAY be a mixture of the round shooting an inch or two low and a combination of shooting technique errors such as anticipation of recoil and breaking the wrists down before one pulls the trigger. If you look in the low left stickied thread, there are charts and videos which may help as well.
Also, make sure you are using the top of the front and rear sight for alignment and not the dots. I have noticed some shooters with difficulty shooting tight groups who did not know proper sight alignment and tried to line up all 3 dots.
You may also want to try a different backstrap with the M&P. Bring them to the range and try the different ones there.