M&P 9 full size mag problems

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roysdad

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Hey folks, my magazines are not ejecting properly. I pulled the slide off and looked at the mag ejection lever - it does not appear to be getting a good purchase on the mag to push it out. My compact version of the same gun appears to catch more of the magazine and thus eject it properly.

I also noticed that the plug on the right side of the grip where you would swap the mag release to is loose and moves when I press the mag release on the left side of the grip. Does anyone have any history with this issue? Better yet a fix.
Thanks!
 
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what's a "mag ejection lever" ?

Gravity should drop the mag, when you hit the mag release button

MP (Semi-Auto) | World's Largest Supplier of Firearm Accessories, Gun Parts and Gunsmithing Tools - BROWNELLS


sw-mpa.gif
 
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The magazine release sticks through the grip. The "plug" is the other end of the button. The magazine release is just a release and is not capable of forcibly ejecting the magazine. Could you provide a more detailed description of the problems you are having?
 
roysdad said:
Hey folks, my magazines are not ejecting properly. I pulled the slide off and looked at the mag ejection lever - it does not appear to be getting a good purchase on the mag to push it out. My compact version of the same gun appears to catch more of the magazine and thus eject it properly.

I also noticed that the plug on the right side of the grip where you would swap the mag release to is loose and moves when I press the mag release on the left side of the grip. Does anyone have any history with this issue? Better yet a fix.
Thanks!
Click to expand...

The mag release button is one piece, there is no plug on the off side of the pistol, that's the other end of the release button (which is why it moves when you push the mag release). As has been said, there is no mechanical ejection of the mag (other than gravity) The button just releases the mag. A new pistol can be tight, or the mags can be sticky.
 
Check the fit of your magazines to the frame. If they are not dropping when released, you more likely have some friction between the magazine body and the frame.

Do your empty magazines drop freely from the pistol by gravity when you press the mag release? If so your pistol is performing normally. As others have noted there is no ejection spring for the magazine.
 
If you have a loaded mag, the weight of the ammo in mag will make it seem as though it's under spring tension. Also, a closed slide on a loaded mag does put exert pressure on the mag. (release a loaded mag upside down).

There is also very (VERY) slight pressure exerted on the follower by the lever that locks the slide back on an empty mag (don't know technical term for this watchamacallit)

Close your slide, load your mag and see if that feels different?
 
OP is this a new gun, or used but perhaps new to you? You mentioned having a compact, could your grip have any effect on the full size (palm somehow helping to hold the mag in place)?

just thinking out loud.... and apologies if i'm off base on that one.
 
Mags come out slowly fully loaded or empty. I have put about 2000 rounds through the gun. I have heard that the mags may swell if they are kept loaded. I have kept mags loaded for some time this is the one in the bedroom along with the 12guage. Perhaps I should try a brand new mag in it and see how it does. thanks for the replies!
 
roysdad said:
Mags come out slowly fully loaded or empty. I have put about 2000 rounds through the gun. I have heard that the mags may swell if they are kept loaded. I have kept mags loaded for some time this is the one in the bedroom along with the 12guage. Perhaps I should try a brand new mag in it and see how it does. thanks for the replies!
Click to expand...

Mags won't swell if left loaded. Steel doesn't do that, wood and paper do. I wipe my mags with a silicone impregnated cloth and they drop easily (always have). I've heard of some imperfections in the plastic in the magwell, you might look in there and see if you can see any shiny spots. Might need a bit of fine sandpaper to get rid of some plastic in that area.
 
I had an FNP-9 that had a similar issue. The mags would release but not drop consistently. It was a combination of a bit of interference with the mag well plus my grip. I found that if I rotated my hand towards my thumb and depressed the mag release they would usually drop (minimum hand contact with the grip). If I held my normal grip and reached for the mag release with my thumb then I ended up squeezing the grip to the point where the mags would never drop. A bit annoying but didn't bother me too much.

I also always thought that the follower was placed under a little tension when loaded so that when the mag release was pressed the mag would eject more than simply drop out from gravity. Probably more so if the slide is in battery but maybe I'm wrong.
 
If the magazine is loaded, and inserted, the magazine spring is pushing the rounds upward and the top round is pressed against the bottom of the slide...creating the tension

If the slide is locked back, that tension is gone.

If the magazine is empty, it's follower is pushing upward on the slide-stop lever, the slide stop lever has spring tension keeping it down, and out of the way, until the mag empties and then it locks back.
 
roysdad said:
I pulled the slide off and looked at the mag ejection lever -
Click to expand...
Mag ejection lever? Take a look at this and see if there isn't a different name for what you think this part is: http://smith-wessonforum.com/smith-wesson-m-p-pistols/341115-m-p-parts-identification.html

Even so, I think I know what you're talking about. Could it be the slide stop? Take a look at this picture:
SlideStopFunction-3-3_zpsf4ebce42.jpg


When the mag is empty, the follower pushes up on the slide stop. This is what holds the slide open after the last round is fires. If you have the old style followers, the slide stop could land on the side of the follower rather than the top like it is in this pic.

Here is a view of old vs new followers:
Old%20vs%20New%20Mag%20Followers_zps6euax1ys.jpg

New on the left.

If the mag follower is functioning properly, the slide stop will add a little extra force upon ejecting an empty mag. However, it won't do anything for a full mag.

I recommend calling S&W about this issue and seeing if they will replace your mags.
 
Thanks Rastoff! ya its the slide stop and it is not sitting on top of the mag follower. I have the old style mags and will follow your suggestion to contact S & W. Excellent photos by the way - what kind of camera did you use?
Bkreutz I will also wipe down the mags. Merry Christmas to both of you guys! God bless you both for your service.
 
Thanks for the compliment. I have a Nikon D5100 which is nice, but I really have a lot to learn. One day I will get a dedicated macro lens, but wow, are they expensive.
 
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