mossberg 100 atr feeding issues

Discussion in 'Gunsmithing Forum' started by mrnewland, Nov 17, 2008.

  1. mrnewland

    mrnewland New Member

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    I got the 100 atr in .308 with the wood stock. gun worked flawless until I
    removed the action from the stock for cleaning. when i reassembled the gun
    the magazine follower felt a bit "hinky" and the rounds don't load or feed
    correctly, IE : first one jams into the barrel/nut area, second is ok, third jumps completely out of the gun and falls out with the slightest forward motion of the bolt. Inspection reveals marks made in the stock inlet area show signs of the follower spring being off center. I've tried about 50 times
    to "adjust the spring this way or that to no avail . HELP if you can
     
  2. lou2200

    lou2200 New Member

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    I also have the .308 in black synthetic stock. I have an issue with not being able to load 4 shells and close the bolt over them. The shells won't compress into the magazine far enough. I also have the same issue as you, except only the last cartridge pops up weird and gets jammed in the barrel/nut area. This only happened with the 150gr soft points I was hunting with. It didn't happen at the range when I used some FMJ Ball ammo.(I haven't tried any other ammunition yet) I emailed the place I bought the gun from, and they put me in contact with the product service manager at Mossberg. He thinks it has something to do with the follower (I told him I thought it was the spring). They are sending me a new follower and spring, I told him if that doesn't fix it I am sending it in to get looked at. I will let you know if it fixes it.
     

  3. spittinfire

    spittinfire New Member Supporter

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    I have the same rifle in .30-06 and haven't had any problems at all. I bought it to drag thru the woods and hunt with and it has done that just fine. It's more then accurate enough for 300 yard shots. I'm curious to the outcome of this for both of you in case I may have the same problem in the future.
     
  4. lou2200

    lou2200 New Member

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    Fix

    Update:
    I took my rifle apart last night, and found that the spring was not seated correctly in the pocket. I cleaned everything and put it back together correctly, and everything works flawlessly now.
     
  5. stalkingbear

    stalkingbear Active Member

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    Was going to point out the follower/spring is not positioned exactly as designed. Some rifles are picky because of follower/feed lip design and easy to get back together without getting exactly perfect. What I do when reassembling rifles with blind magazines is assemble upside down. That means the follower is exactly where it needs to be, then going in stock last. Try putting it together with scope on bottom with stock on topside-that way you'll be ensured of proper follower placement every time-1st time.
     
  6. AimHigh

    AimHigh New Member

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    I bought the 100 ATR in .270 Win at Wal-Mart last month and have the same feeding problems. There is a "cutout" in the bottom of the stock for the spring to ride in, but getting it situated just right is a chore. The last round out of the mag either jumps out when I extract the the previous round from the chamber or it turns sideways when I try to feed it in the chamber. The American Rifleman article from a few years back said it had a sheet metal follower. Mine seems to be plastic. I emailed Mossberg on this but haven't heard back yet. I tried to put a dab of silicone on the spring to hold it to the stock at the "right" place, but that didn't work. I also noticed that the diagram of the mag. box showed a bend or depression on the right side. Mine is perfectly straight. Any other comments or ideas?
     
  7. mrnewland

    mrnewland New Member

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    Long at last resonse to original post. after diassembling /reassembling this firearmm 10's of times I sent it back to mossberg in Eagle Pass Texas. After 6 weeks I got it back. The follower and spring had been replaced. But the same problem is still present. It seems to be part of the design for the rounds to be barely controled as they are stripped out of the magazine. I actually placed four empty shell cases from a .270 into the magazine and they actually behaved better than live ammo (with the exception of actually chambering) when cycleing the bolt in and out. The walls of the .270 are a bit straighter than .308 along with being longer. As of now Mossberg has stated that this is as good as this firearm will perform and that I should consider purchasing a 4x4 with a detachable box magazine. So I am simply stuck with a defunct firearm. I also own a Savage 110 with an internall box magazine designed for a straight line feed. I am considering purchasing a magazine for the short action Savage 10 rifle and adapt the stock of the mossberg to adapt the mossberg for a straight line feed system. Any pointers are welcome!!!
     
  8. AimHigh

    AimHigh New Member

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    mrnewland: Is your follower plastic? My problem in .270 is that if you load one round, it will not feed. If you load three rounds (top round in the same position) it will feed. This means that the steel ridge (that's used a a bolt guide on the right side) is large enough to keep the top round under tension and hold it there until the bolt moves it forward. The difference is in the side pressure as the bolt pushes the round into the chamber. I looked at an AK-47 mag I have. There is a form of a cartridge molded in the follower to keep the last round positioned correctly for feeding. I'm wondering if an empty case could be cut lengthwise and super glued or JB welded to the follower to keep that top round positioned. This may be a better idea than cutting and swapping stocks. You could also heat an empty case and lightly press it in the follower to create an "impression" that would hold that round a little better. -AimHigh
     
  9. mrnewland

    mrnewland New Member

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    Aim High: If my only feed issue were the last round out, This would probably work. however the first round out of a full mag seems to jam to the rightside
    of the action. The second round seems to feed right but the third jams as well. the the last round jumps out of the reciever about one thid the way into battery. the first and third are positioned on the left of the reciever and both jam. In order to use this rifle in hunting conditions I must be able to cycle the action and feed a new round without having to look into the magazine and fumble with the ammo. It must work flawless every time. so I am unsure how to get the reciever and follower to correctly manipulate the
    live round. Thanks for your input.
     
  10. stalkingbear

    stalkingbear Active Member

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    I have the perfect solution for you. Since only every other cartridge feeds ok, just shoot every other deer!:D











     
  11. BILLYBOB44

    BILLYBOB44 New Member

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    Feeding PROBLEMS

    Ya know Bear,sometimes the easy solution is he hardest to see!!:D:D
     
  12. AimHigh

    AimHigh New Member

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  13. mrnewland

    mrnewland New Member

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    just logged on, STALKING BEAR, your input is humorusly correct. however, I have laid in a few strips of duct tape against the slope side of the follower and have some improvement. I then made this thickness improvement permanent by laying in epoxy and filed down changing the angle of the slope to be sharper of an incline. this fixed all but the last round issue. I the reshaped the steel box portion of the magazine well on the right side due to the follower tending to tilt up to the right side in the mag well. this has fixed the last round jumping issue 8 out of 10 times. the follower is a bit too narrow and is sloppy side to side so I'm seeking a way to narrower the box without destroying it in the process.
     
    Last edited: Jan 31, 2009
  14. AimHigh

    AimHigh New Member

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    Could you post any pictures? I am still waiting for Mossberg to send me a new follower/spring assy. and mag. box. Once I get those I can "play" with the old ones and see what works.

    I looked at the feeding process over and over as I worked the bolt. It seems that the follower is rocking or jumping as the rounds come up. I smoothed the sides of the follower with a jeweler's file, but no help. You are entirely correct that the follower has a lot of side-to-side movement.

    I can't get it to copy but if you go to page 15 of:

    http://www.mossbergs.com/manuals/100ATR_en.pdf

    you can see that the magazine box is not flat sided as it is in actuality. If it was cut and bent in it would take care of the "slop" in the follower. However, it may push the round to the right too much and not "catch" the bolt guide on the right side. -AimHigh
     
  15. AimHigh

    AimHigh New Member

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    I should have added that a guy in another forum had the same problems and seemed to fix it with duct tape and epoxy. see:
    Mossberg ATR 100 - Page 8

    -AimHigh
     
  16. mrnewland

    mrnewland New Member

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    That other person is most likely me as I also post to that forum a little now and then. I'll attempt to take a few photos tonight if I can get my wife to show me how to uplaod and what not. Unfortunately, I don't have any before Photos!
     
  17. raffmanlt

    raffmanlt New Member

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    Mossberg 100 atr feeding problems

    I had the same problem and finally got mine functioning properly. Mine always seemed to want to hang on the 4th bullet if I only had 3 in mag worked fine. Then I took it apart to clean, after taking stock off and reassembly I then had all kinds of problems. It seems to be very picky on how clip, feeder and spring are lined up. I also noticed if I tightened the screws too much the bolt would bind.
    What fixed it: I propped the rifle upside down sitting on its scope. Then this time I left out the spring and feeder, I made sure I had the metal frame of the clip turned with the widest area to the back of gun and the small notch which allows the bolt clearance was towards top of gun. Aligned it carefully with the barrel of the gun and it sort of snapped into place. Tried holding the spring in its proper position in the stock which is easy for it to get misaligned. As I lowered the stock guided the feeder into the mag and let it move freely while I held onto the spring in the stock. Lined it up and pushed them together. This time it seemed to snap together better and the screws were easy to start which did not happen the first 4 times.I was very pleased that it started working flawlessly. Curiously if I really tighten screws still binds the bolt but much less than before. With it slightly backed off all works perfectly.