M&P "10 round mag" a lie, more like 9..

I have tried twice with M&P 40 mags and cannot get them to retain more than a few rounds of 9mm.

As for the 10th round issue, pull your mags apart and shave a little off the bottom of the follower's legs.
This will provide the extra wiggle room to easily get that last round in.
 
XRCD011 said:
I have a silly question. Can a M&P40 or 45 fit in a M&P9 and hold and feed 9mm rounds??
Click to expand...

No. I tried my 40 mag in the 9 and it does not work. Lips are too wide.

Take the mag apart. The plastic follower has a front and back leg with a inverted U shape in it. Take a file and remove a tenth of an inch from the bottom of both legs. I filed enough off to make the U go away. It now hold 10.75 rounds. 10 load easily.
 
My M&P9 mags were very tight when new, about 500 rounds later and they are getting easier to load all the time. I suspect around the 300 round mark I could start getting 10 in there.
 
I have an m&p 40 and after about 150 rounds in one magazine it loads 10 without any issues. As for 9mm. Never actually shot any out yet but my 40 mags will hold 9mm. Brb will see how many rounds they hold
 
luckyfanfan said:
The speed loader wont be able to load the 10th round...i have to hand load it the 10th round, and it takes some strength,,,
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It gets it in. You just need to hold it a bit different on the last round. I think it was not squeezing the thing fully closed and letting the little ramp hit the previous cartridge a little further forward that did the trick.
 
Ganderite said:
Take the mag apart. The plastic follower has a front and back leg with a inverted U shape in it. Take a file and remove a tenth of an inch from the bottom of both legs. I filed enough off to make the U go away. It now hold 10.75 rounds. 10 load easily.
Click to expand...
I did this as well. It works great and there is no trimming of the spring required.
 
Ganderite said:
No. I tried my 40 mag in the 9 and it does not work. Lips are too wide.

Take the mag apart. The plastic follower has a front and back leg with a inverted U shape in it. Take a file and remove a tenth of an inch from the bottom of both legs. I filed enough off to make the U go away. It now hold 10.75 rounds. 10 load easily.
Click to expand...

This is the answer..period. The follower bottoms out before the 10th rd can be loaded. Some mags are worse than others.

Take Care

Bob
 
CV32 the older mags were not a problem. S&W changed suppliers for the followers and the most recent mags have followers that are just to long and bottom out in the 10 rd mags. I suspect they work fine in the high cap mag bodies.

Take Care

Bob
 
I bet they load 10 with ease. Sounds like you guys have to trim your followers as well. Not sure why S&W doesn't deal with the problem. Maybe they will when they order new followers from their supplier. I am sure they have had their ears burned over the issue. One of my 10r rounders wouldn't take 10 rounds no matter what you did until the followers were trimmed. I see you can now buy extended followers to convert high cap mags to 10 rounds. I may have to look into this as I have several high caps in the US for use when I am down there.

Take Care

Bob
 
I called S&W on this and the guy said that it's a liability issue. If you make the mag 10rds, guys will try to squeeze in 11. They make the mags 9 rds but you can squeeze in 10 but there is no way that you can squeeze in 11.
 
I just got 4 new 17rd mags - no issues with loading to 17 -- tight - but not unreasonable.

My guess is the super tight or impossible 10's are tolerance stack on parts, a few thou here and there...
 
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