M&P 9mm ejection issue...again.

well for what it is worth i am going to briefly add my two cents worth of info. i bought a fullsize m&p 9 back in december and have only gotten outside for the second time today to do some shooting. i am also having the issue of getting hit in the head, arm, and shoulder. i am shooting 115gr.fmj and have shot only 300 rounds through it. i will be emailing s&w to arrange for repairs. why, you may ask? because i don't know how many pounds the m&p 9 shield's spring has, but it has a heck of alot more snot than the full size, i brought the 9 shield home last week and it ejects flawlessly. in my opinion then, the spring, ammo, and user are out of the equation. no?
yes i know that the shield's spring is dual acting, that shouldn't matter though if the snot is there. correct?
 
Rastoff said:
allenff1,
The smaller the slide, the stiffer the spring. So, the Shield will always be more stout than a full size.
Click to expand...

That's pretty much what i was getting at, what I am trying to work with. The different stock spring specs lead me to conclude that replacing the full size's spring with a weaker one would not always be the correct solution. The stiffer spring of the shield would cause the slide to move rearward slower than a weaker, non-spec, spring in a full size.

What I am trying to say using the same ammo, the same platform, the same slide travel, and the same shooter:

The stock spring of a full size is weaker than that of a stock spring of the shield. The weaker spring allows a faster rearward slide speed. A faster rearward slide speed pulls the casing into the ejector faster allowing for a "snappier" ejection and not throwing the casing at my head and shoulders. My shield with a stiff spring and slower rearward slide speed ejects casings without issue to about 4:00. (don't hold me to that vector)

I had and have this problem, read about the problem and possible causes, but now that I have the shield my gears are turning.
Maybe my knowledge and physics isn't right on how the slide speed and spring stiffness play a role in this situation? :confused: Armorers?
I might just be throwing a wrench into the discussion too.
 
No, not throwing a wrench into it, but maybe not fully understanding it either. You are definitely on the right path, but may be wandering a bit. Let me offer up this and see if it helps any.

The goal of any semi-auto is to match the recoil spring with the load and the mass of the slide. Get all three matched up right and you have a sweet, smooth operating gun. Get one or more wrong and problems are inevitable.

It's not just the recoil spring that sets slide speed. It's a combination of slide mass, recoil spring weight and the cartridge load. S&W does their level best to match things together so, any of their guns can shoot a wide variety of loads. Alas, it's impossible to be perfect for every load. Also, you can't easily change the mass of the slide. So, you're left to experiment with the spring and load. The easiest to change is the load.

How many different loads have you tried? If it does this with every load, then there may be a problem with the ejector.
 
Well due to an over abundance of ammo caliber and weight options around here i have only used 115 gr. fmj. The only thing I can use as a defense to only knowing the performance with one load is to say that I know of others here with the 9's that have had no issues. For S&W I think this is pretty shoddy. The M&P was recommended to me by a friend who is chief of our local police department and he is stunned by this. They haven't had any issues although they do only use the 40---I know where that is going now. ;)
Thanks for the further explanation too.
 
You did not.
I sent an email today. An automated response said that I should be contacted within 5 days.
 
I had finally gotten the return label, shipped it out on March 5th, and got it back today. Not too shabby. But now I am restricted by weather and schedule to get outside and try it out.
The extractor was changed and they polished the chamber. I'll see if that fixed the problem. Any input?

I didn't realize one would need a polished chamber but "polishing the inside" of artillery shells saved the boy working in schindler's factory, according to the movie.
 
S. Kelly said:
And here I thought the brass hitting people in the head, face, etc. was strictly a Glock 9mm problem.
Click to expand...

M&P's had bad extraction issues before Glock ever did, now a days it's certainly more common with Glocks as previously mentioned, S&W tweaked extractor design. The fact Apex makes extractors for both is a clue both companies have had issues at one time or another.
 
Fastbolt said:
The slide being released upon vigorous insertion of the magazine is something that can happen with a number of the plastic pistols that use low profile slide stop lever engagement tabs. It's usually more shooter-related than specific gun related.

Slide release on vigorous magazine seating, is common place and like Fastbolt says, it's usually a shooter manipulation issue and not a gun issue. I'm a retired LE instructor as well (40 years worth) and worked for S&W and have seen this with all pistols. I have generally found that a shooter that is experiencing this is seating the mag and with a slight forward motion. This forward motion "unloads" the slide stop by causing the slide to momentarily and slightly move to the rear. The Slide stop is spring loaded to the down position, and now, with a loaded mag now in place, there is no mag follower to hold it in the slide locked position. Seat the mag straight in and just firmly enough to insure it's seated. Problem will disappear.
Click to expand...
 
Posts are 2 yrs old and yet the same issue still happening

I have bought a New M&P9 and M&P9 Pro within the past few months. I started to go to the range with my husband and really liked the way the M&P9 performed outside of a few random ejections hitting me in the shoulder. Please bare with me as I'm very new to all of this. My husband and his brother who is a police officer and the staff at the gun range said to use American Eagle which I had been using in both guns.
The newest gun, the Pro was nothing like my first gun. Casings were hitting me in the mouth and face. I was really surprised because this had never happened before and is quite distracting me. It made me feel as if I made a huge mistake in purchasing this gun. It's one thing to have a random casing hit your shoulder or even your head, but your mouth and face is quite different. My aim is off and I can't focus. I'm trying to prepare for my concealed carry and this was why I got this gun, I wanted the better sights and grips and none of that matters with this distraction.
I am disappointed to find that this has been happening for quite some time now. I have only had my gun for a couple of weeks and hope that I won't have to send it in for repair as often as many of you have had to do here.
If anyone here has any advice for a female just learning I would be happy to listen. Especially one who is already running into having this type of problem.
Thanks for your input.
 
I thought all the "Bugs" were worked out on the current M&P9 FS

Are any others having "brass to face" problems?

I haven't been to the range with mine yet, but the trigger
is rather heavy @ 8.5 lbs, but at least the reset is good.
 
clarkz71 said:
I thought all the "Bugs" were worked out on the current M&P9 FS

Are any others having "brass to face" problems?
Click to expand...
This is the type of problem that is not going to go away. It can be chalked up to probability. If you look at the number of pistols that have this problem vs those that don't, there is a huge difference. I'll bet it's something on the order of 1,000:1. When it comes to manufacturing that is not a great probability. However, you have to take into account the cost to fix it. S&W has clearly decided that it is cheaper to fix these individually than to make the necessary changes to the production line.

You must remember that this is not an expensive gun. In fact, it's at the bottom of the reliable/functional guns. Don't get me wrong, $500 is not cheap. But when compared with the rest of the handgun world, it's in the bottom 25% price wise.

Brass to the face is an ejector position issue. It's a matter of bending the ejector about .05" to correct. In this type of gun, it's going to happen from time to time. S&W will pay to ship the gun in, make the necessary tweak and get it back to you in less than two weeks. For a $500 gun it's no big deal.


clarkz71 said:
I haven't been to the range with mine yet, but the trigger
is rather heavy @ 8.5 lbs, but at least the reset is good.
Click to expand...
Stop worrying about problems you haven't had. Shoot the gun. It's very unlikely you'll have a problem.
 
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