I have a full size M&P 40. One of the magazines is driving me nuts with ammo rattle. :blink: I load it and about where the 7 / 8 hole is on the mag you can literally see the cartridge moving slightly forward and back. I have inspected and cleaned the mag inside and out. There is no visible indicator of any damage or non-uniformity that I can see. I have also put different ammo in the mag and same place... same rattle.

I know it sounds trivial but in a concealed carry environment I am not interested in having a rattle. I assume that there must be a slight gap or misshape to the mag in that area allowing for this?
Thoughts, suggestions, fixes?