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ATTN: Cartridge Stopper QC Issue for Pump Actions (FTF)

Discussion in 'Firearm Maintenance, Safety And Troubleshooting' started by Water Monkey, Jun 25, 2013.

  1. Water Monkey

    Water Monkey The man, the myth, the monkey Moderator Supporter

    Messages:
    3,803
    Based on several complaints, including myself, it seems there may be a QC issue relating to Mossberg's Cartridge Stopper which is causing a specific operation failure - Failure To Feed (FTF) from the magazine tube upon racking the slide.

    ISSUE IS A FOLLOWS:

    Seems the Cartridge Stopper is bent too far during production.

    CAUSATION OF ISSUE:

    Because the Cartridge Stopper is bent too far the action slide rod is going behind the Cartridge Stopper instead of infront of it. It MUST go infront of it in order to cause the shell to eject from the magazine tube.

    CORRECTION OF ISSUE:

    Take the Cartridge Stopper out of the receiver and bend it in the opposite direction in an effort to make it straighter. This will take some effort so dont be afraid to put some gradual and consistent pressure.

    Place the Cartridge Stopper back into the receiver and try and cycle dummy rounds until you get consistent ejection results.

    Repeat this step as many times as necessary.

    IF LEFT UNCORRECTED:

    You will wear down the Cartridge Stopper and the Action Slide Rod which will cause you to replace both items at a cost of approximately $60.

    See my post for examples of excessive wear at the 400 round mark:

    viewtopic.php?f=22&t=4174
    Mariano Urquiza likes this.
  2. aksavanaman

    aksavanaman Work In Progress... Supporter "Philanthropist"

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  3. John A.

    John A. I'm "THAT" guy Staff Member Global Moderator Moderator

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    14,387
    I am going to have to replace both the cartridge stop and the Cartridge Interceptor Assembly in my 500A.

    It has started to cause an intermittent failure to feed and I cannot have that.
  4. nitesite

    nitesite Sheepdog Moderator "Philanthropist"

    Messages:
    5,568
    How many owners of Mossberg pumps who have been affected by this poor QC will never be known it seems. Damn shame it wasn't caught real early by OFM and corrected properly, including free parts to consumers.
  5. John A.

    John A. I'm "THAT" guy Staff Member Global Moderator Moderator

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    To be honest nitesite, this isn't the first issue my one and last 500 has.

    The mechanical safety has not worked in probably 8 years either and they seemed generally uninterested when I called them to report the problem and to ask that they repair it.

    But I will guarantee that they better pray it never goes off and hurts anyone because of it because I do have documentation and call recordings.
    valvestem likes this.
  6. Tanker

    Tanker .270 WIN

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    143
    I am still unclear on what to modify. Can yo update with arrows pointing to what needs to be tweaked? THanks, Ron
  7. GunnyGene

    GunnyGene Racist old man BANNED

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    4,005
    I've only had my 1989 Mariner for a few months, so maybe the previous owner fixed all the problems that are talked about here. It hasn't given me a lick of trouble since I've had it, and fired maybe 50 rnds of various loads thru it from birdshot to slugs.
  8. LAZY EYED SNIPER

    LAZY EYED SNIPER Overwatch Staff Member Global Moderator Supporter "Philanthropist"

    Messages:
    21,106
    From what I've seen in my time on the site this is a recent issue.

    The likely cause is a big batch of out of spec parts that were installed and made it through QC without anyone noticing. Either that, or they did notice but let 'em ship anyway. Either way this is a pretty widespread issue on models made within the last two years or so...
  9. GunnyGene

    GunnyGene Racist old man BANNED

    Messages:
    4,005
    Well that makes me feel better. And really smart ;) :lol: . Before I found this used Mariner, I'd been looking at new 500's and 590's and nearly bought one.
  10. old mossy

    old mossy Global Moderator Staff Member Global Moderator Moderator

    Messages:
    12,616
    the problem is with SOME of the cartridge stoppers.
    if you are having a problem with your gun,email mossberg and they will send you another.
    you can fix it yourself with some patients and a few tools to straighten or bend it. if your not having a problem,leave it alone.
    below is a pic that shows the cartridge stopper.

    Attached Files:

    Bobster likes this.
  11. John A.

    John A. I'm "THAT" guy Staff Member Global Moderator Moderator

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    14,387
    OK, I'll try that.

    I sent them an email on their website contact page.

    Let's see if I even get a timely reply.



  12. old mossy

    old mossy Global Moderator Staff Member Global Moderator Moderator

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  13. Tanker

    Tanker .270 WIN

    Messages:
    143
    Thanks. When I get mine (hopefully this week, Bud's is slow), I will have to give it a work out. Ron
  14. old mossy

    old mossy Global Moderator Staff Member Global Moderator Moderator

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    don't forget the pics. :D
  15. Tanker

    Tanker .270 WIN

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    143
    I think I may understand, so correct me if I don't have it. On the pic with the red circle, the part(action rod) where the red arow is has to ride behind the part (cartridge stop) where the green arrow is. Right? Ron

    Attached Files:

  16. old mossy

    old mossy Global Moderator Staff Member Global Moderator Moderator

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    12,616
    ,,,,,correct.
  17. Tanker

    Tanker .270 WIN

    Messages:
    143
    Great
    When I get mine and the red arrow part(rail) rides behind the the cartridge stop, I will be relieved!
    They said it is in shipping now, so hopefully I will have in hand by Wednesday or Thursday.
    Then the pics. Ron
  18. old mossy

    old mossy Global Moderator Staff Member Global Moderator Moderator

    Messages:
    12,616
    a big thing i've noticed is when a gun starts acting up(not racking as smooth as it was) a lot of people force the action and wind up bending and doing more damage to the gun.
    if you know the feel of your gun and all of a sudden it changes,,,,,STOP,,,don't go forcing things.
    take a real good look at what's going on with it. JMO.
  19. Tanker

    Tanker .270 WIN

    Messages:
    143
    When I say behind, that means the cartridge stop is pushed to the receiver side and the rail comes back over the cartridge stop and completely covers it when slide is full retracted.
    I think I was confusing what behind meant. When operating correctly the slide rail completely covers the cartridge stop and you do not see the cartridge stop. When they say behind, they mean the rail rides between the reciever and cartridge stop.
    The slide rail has a bevel and the cartridge stop is bevels and the only way it woudl work correctly is by pushing the cartridge stop to the reciever side.
    Ron

  20. John A.

    John A. I'm "THAT" guy Staff Member Global Moderator Moderator

    Messages:
    14,387
    Old Mossy, I received a reply to my email today.

    Quite a change from my last experience with their customer service.

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