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M&P Performance Center Ported 9L problems


Patruck825

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Hey all, wanted to throw this issue out there and see if I can get any insight on how to fix this issue. I have a new M&P performance center ported 9L and its having trouble both ejecting and chambering rounds.

Ammo is 115gr RN FMJ and I don't intend to step up to a heavier projectile, id like this gun to function with anything. I'm not a new shooter, limp wristing is not the issue.

When I shoot, sometimes the slide doesn't come back far enough to eject the spent round, when it does, it barely tosses the brass a few inches and then jams the next round into the feed ramp and gets stuck. When that happens a very gentle tap on the rear of the slide is all it takes to chamber the round.

The gun DID function a bit more reliably with 124gr projectiles. But like I said, I want to be able to shoot 115gr.

The gunsmith at the range agreed with me that the factory recoil spring felt awfully heavy for the gun, so i've ordered up some ISMI 11# and 13# springs from SSS, the factory spring is 16#.

Now my concern is, the lighter recoil spring may help with ejecting the round, but I fear it may not help the issue of chambering the next round. im unsure if the reason the next round isn't chambering is because the slide isn't coming back far enough to get a full run at the next round, or if the spring just isn't cutting it in terms of pushing the slide forward. im not 100% certain if a striker spring change would help anything?

I called S&W and they are sending me a factory spring and guide rod assembly, as they don't have any different weight springs for the MP PC9, not really sure why, but ill take the free parts..

any insight is appreciated!!

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When I Magnaported my 5" Core, I had to drop the recoil spring weight to 15# to work with factory 115, I switched to 124 and went back to the 16#. These were all my own handloads and the 115 were kind of a powder puff load (126 PF), my 124's were 136 PF. I haven't shot factory ammo in years because I don't trust them due to a bunch of failures (click, no boom, primers in backwards) and now I shoot 9 major so I'm out of luck there if I wanted to use "store bought" ammo. :roflol:

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As you know, there is some velocity loss with the ports but given this is factory ammo, re-springing is probably the solution. Good luck to you!

Sent from my iPhone using Tapatalk

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thanks! ill post when I resolve it!

While were at it, anyone here have any experience with Win Autocomp? i've got a pound of it, and 500 115gr eggleston munitions poly coated bullets and i'm looking for a load that would suit this ported gun. PF isn't really a concern for me yet as I haven't stepped into the competition realm, just want something that suits this gun the best so I can practice and head in that direction.

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  • 2 weeks later...

UPDATE: so ive sorted out the issues with the FTE/FTF, now ive run into a couple more issues. the ammo issue was sorted out by just firing the crap out of it (about 800-1000rd so far), it feeds and fires my handloads perfectly, and only sometimes doesn't lock back on an empty mag with crappy factory ammo.

The problems im having now are. ..

The gun shoots 2.2 inches low at 7 yards from a rest, all shots in 1/2 inch. OK fine, ive seen factory sights off before, no big deal....Called dawson precision talked the math with them and they asked me to step out to 15 yards and see where it was. OK...now from a rest, the gun is shooting 4 inch groups at 15 yards..kind of hard to tell dawson how low I am when the spread is so big.None the less, dawson had me take the middle of the group and it came out to 3.2 inches low, and are sending me a .280 front sight (stock was .315), this will at least center my group. But now my concern is the guns accuracy itself..

Whats weird is its more of a vertical string (about 1.5 inches wide and 4 inches tall). Ive never had a problem shooting one ragged hole at 15 yards with any other gun, let alone off a rest. What on earth is going on here?

I called S&W and they said 4 inches at 15 yards is okay, but it should really be around 3 inches or less..again, this just seems a bit loose for something that wears the performance center name. id be unhappy with any handgun that performed this way, are my expectations too high? Have I just been extremely lucky with the past 20 something guns ive owned?

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  • 2 weeks later...
  • 2 weeks later...

anybody with some input? im reading everywhere about the 9mm having early unlocking issues, but I have no idea how to tell if that's what im experiencing.

I wish i had better news for you but all four of the ones ive owned would not do better than 4" at 15 yrds either. No matter what ammo. My 5" pro was the worst at 6" groups at 15yds. Even a kkm bbl only made it a little better. I still own one of them but went to an XDM 5.25 for my competition pistol. Much better accuracy. I really like the m&p, but the poor accuracy (by my standards) is unacceptable to me.

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Did you put the new guide and spring in? I had mine really open up shot spread when the recoil spring was worn out. So, maybe just a bad spring? Also, inspect rifling for machine marks or deformities (had a revolver with this issue).

THIS. When my CORE was set up with a 13lb recoil spring, the groups would string vertically. When I went back to the factory recoil spring the groups tightened. I get around 2" at 25 yards from multiple factory barrels.

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