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Mossberg 935 Magnum Autoloader Troubleshooting...

Discussion in 'Mossberg 935 Magnum Autoloader' started by DHonovich, Sep 3, 2010.

  1. Joe Collins

    Joe Collins .410

    Messages:
    39
    Yea, I tried that too and it didn't like to load the high brass shells either. I'm thinking I should just send it back and see what Mossberg can do for it.
  2. Rossignol

    Rossignol The Original Sheriff Staff Member Global Moderator Moderator Sponsor

    Messages:
    12,758
    Strange. Though it sounds similar to issues folks have had with the 930 too but it should have run the full power loads its intended too. Dumping several shells sounds familiar too and I don't have an auto loader so I don't recall the fix. You could peruse the 930 section... Or as you said, contact OFM.
  3. Joe Collins

    Joe Collins .410

    Messages:
    39
    Gotcha, yea I'll probably just send it back to mossberg. Thanks for the help Rossignol!
  4. OR3GUN

    OR3GUN Sponsor Sponsor

    Messages:
    220
    Joe, how heavy is the spring that came with your extension? Sometimes the longer extensions come with a heavier spring that doesn't always work well unless cut a bit shorter. We run Wolff magazine springs in our guns as they are a bit lighter and can be run in longer extensions without creating too much tension.

    Another possible issue could be your follower or the concentricity of your extension nut. The factory follower in a 935 is short and was never intended to go past a magazine tube seam. If the follower hangs as it feeds you can get a temporary lack of tension against the shell stop. When you cut your spring, make sure you turn both ends down and in just a bit. This prevents the spring from digging into the extension cap and/or follower and binding as the spring compresses or canting your follower in the tube. As for concentricity of your magazine tube and nut/extension, you can remove the extension cap, spring and follower and sight down the assembled magazine tube assembly to see if your nut is canting the assembly at the seam. You can also drop the follower down the assembly with the gun rotated a few degrees more each time and listen for the follower hanging up on transition.

    Feed from the tube issues are the same from the 930 to the 935 so there are a lot more resources in the 930 troubleshooting section.

    William

    http://www.OR3GUN.com
    Rossignol likes this.
  5. Rossignol

    Rossignol The Original Sheriff Staff Member Global Moderator Moderator Sponsor

    Messages:
    12,758
    That's a good deal more helpful than I could have been!
  6. Joe Collins

    Joe Collins .410

    Messages:
    39
    Thank you William!


    I think I talked to you about my issue on your website. I do have all the upgrades your company made for the 930/935 (including the follower), but I will definitely buy a new Wolff spring if you think that might help!


    It seems to me that it either has to be the magazine spring that is the problem or the shell stop that is the problem.


    The follower flows very freely down the mag tube and it seems pretty straight down the magazine bore as well. I did follow Nordic Components instructions of turning the spring ends into the center of the spring body, so I don't think that could be it.

    Joe
  7. tcecil88

    tcecil88 .30-06

    Messages:
    1,214
    I am hoping someone here can help. My 935 will not feed (hand cycle) from the tube reliably. Alot of times it will lock back with a round in the tube, sometimes will not lock back at all, sometimes it will feed 2 rounds and jam the gun, and sometimes it just locks up totally and I can't move the bolt at all until I remove the shells from the mag tube. It always locks back with a totally empty gun. I found this out after installing the OR3Gun enhanced field combo, but I do not think it has anything to do with it as I put all the stock components back in and it still does it. I think the shell retainer on the ejection port side of the receiver is the culprit, but not sure.
    Thanks for any answers.
    Last edited: Sep 28, 2020
  8. OR3GUN

    OR3GUN Sponsor Sponsor

    Messages:
    220
    It sounds like you have the fairly common burr on your shell stop and/or possibly some crud (technical term) built up behind the shell stop assembly. Both will be addressed by performing the procedures on Brownell's link below:

    https://www.brownells.com/aspx/learn/learndetail.aspx?lid=15831

    That along with ensuring your magazine spring is in good shape and proper tension (extends about 12" -14" past the length of the magazine tube) should take care of the issue you are having with your 935.

    William

    http://www.OR3GUN.com
  9. tcecil88

    tcecil88 .30-06

    Messages:
    1,214
    I took the shotgun apart, cleaned and polished the shell stop and put it back together. No change. The magazine spring only sticks out about 10 inches, so I ordered a new one from Mossberg.
    I did notice that the shell lifter tends to hang on the back of the shell stop at the bolt hold open. I am going to check that and polish it next. I also noticed that the trigger group has alot of slop in its fit with the receiver. I don't know if this is by design or if that is getting worn as it appears to be a polymer housing. I bought the shotgun used, so who knows what the previous owner did to it before I got it.
    Maybe between all this I will get it fixed.
    Have a great day.
  10. tcecil88

    tcecil88 .30-06

    Messages:
    1,214
    So I got the new magazine spring from Mossberg and installed it. It made no difference at all and is the same length as the spring that was in the shotgun to start with. I called Mossberg tech support and they told me that the shotgun was designed to load one into the chamber manually and the recoil will make the next round feed from the tube. It is not designed to hand cycle. My mossberg 930' feeds from the tube just fine while hand cycling. I think the guy at mossberg does not really know what he's talking about, but I will shoot it this weekend and see.

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