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[Erick Danielsen]

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[Brandon04GT]

I basically had the exact same problem with one of my mags and recently sent it in to S&W. They called me back and said they were going to be sending me a replacement but it will take several weeks.

My good mag:



My bad mag:

[CV62]

I actually bought a NOS M&P 9C mag which is the older version with the shiny mag finish and with the gray non-marked follower. So I called S&W about the difference between the two follower and he said the older ones are better so don't change it. No real explanation but he just said it's just a better design. At least I got 2 pinky extension from the conversation.

[WWDHD?]

I have 4 mags for my M&P and one is different than the others. It's harder to load but seems to work fine. I'll have to go down to the safe and compare them to the pics here.

[Erick Danielsen]

I have 4 mags for my M&P and one is different than the others. It's harder to load but seems to work fine. I'll have to go down to the safe and compare them to the pics here.

Any issues with them dropping freely from slide lock?

[Erick Danielsen]

I actually bought a NOS M&P 9C mag which is the older version with the shiny mag finish and with the gray non-marked follower. So I called S7W about the difference between the two follower and he said the older ones are better so don't change it. No real explanation but he just said it's just a better design. At least I got 2 pinky extension from the conversation.

"Older ones are better so don't change it." Why the heck did S&W change them??? Lame...

[MossbergMan]

It may be as simple as a mag spring replacement for the magazine that doesn't reliably eject.
Of course an inspection of the follower is in order too. If it's missing the slide stop or lodged against it, it will impede ejecting out the bottom of the gun.
Of course, as always, make sure the gun is held vertically when dislodging a magazine. Slight angles can disrupt an empty mag ejection too especially if you have a weakened mag spring.