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AR15 feed issue.

Discussion in 'General Firearms Forum' started by Glock19Fan, Jan 21, 2013.


  1. Glock19Fan

    Glock19Fan
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    Cool Guy

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    I got an Olympic Arms AR15 a couple of weeks ago. Ive heard bad things about them, but the deal was just too good to pass up (I traded a $450 firearm for it).

    Anyway, I took it to the range today, charged it, fired, and got a feed problem. I took a couple of pictures, but in case you cant see it appears the cartridge got stuck under the bolt rather than being pushed in from of it. It made it only halfway out of the magazine, and was starting to go inside the chamber but got stuck. When extracted, the cartridge case had two large dents on it from the pattern on the bolt.

    This was M193 type ammunition, the weapon was detail cleaned before the range, and well oiled.

    [​IMG]
    [​IMG]

    Any way I can fix this?
     

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  2. battlin bulldog

    battlin bulldog
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    sand

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    What kind of mags where you using and what was the condition of the feed lips? It is most likely a bad magazine.spring/follower/ bent feed lips... And not to sound like an smart*** but was the mag seated all the way. I hope any of these remedy your problem.
     

    #2 battlin bulldog, Jan 21, 2013
    Last edited: Jan 21, 2013
  3. Glock19Fan

    Glock19Fan
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    Cool Guy

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    The is the older "Plinker" model with the cast lower by the way.
     
  4. Happypuppy

    Happypuppy
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    It does look like a mag problem. It looks to me like it tried to feed it and was hung up on the lips for the mag causing the dents.
     
  5. Glock19Fan

    Glock19Fan
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    Cool Guy

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    I mayyy have found the problem?

    While disassembling it, I looked at the gas rings and it appears one of them is partially missing. These also seem stationary.

    [​IMG]

    I also took pictures of the rest just in case. The magazine is a pretty newer production Brownells in good condition.

    Here is the bolt
    [​IMG]
    Upper
    [​IMG]
    Lower
    [​IMG]
     
  6. Tango 1Zero

    Tango 1Zero
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    Weak ammo?

    ah see you may have found it as I was posting.
     
    #6 Tango 1Zero, Jan 21, 2013
    Last edited: Jan 21, 2013
  7. Glock19Fan

    Glock19Fan
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    Cool Guy

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    I doubt it, this was 5.56 ammo.

    I am gonna try to get some new gas rings and replace them to see if that corrects the issue.

    Does anyone think bad gas rings would cuase this problem? They are pretty bad and like I said it looks like someone cut a section off one of them.
     
  8. byf43

    byf43
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    I would suspect either the magazine (easy enough to eliminate - use another magazine!), or, check the barrel to receiver fit, specifically the feed ramp(s).
     
  9. WoodenPlank

    WoodenPlank
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    Who?

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    The gas rings could definitely be the culprit, especially if one is damaged. Magazine is also a very likely culprit.

    Once you replace the gas rings, try loading ONE round into the magazine and fire. Does the bolt lock back? If not, you likely have a gas problem causing short stroking.
     
  10. Tony Rumore

    Tony Rumore
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    Your gun is either short stroking for various reasons or the mag is letting the head of the cartridge case sag down in the mag slightly. The bolt is actually catching the cartridge in the groove/rim of the case, not getting behind the case head. When the bolt catches in the groove, it will shove the round out of the magazine but the cartridge will tilt upward enough to allow the bolt to slip out of the groove and run up the case body, leaving that dent.
     
  11. Glock19Fan

    Glock19Fan
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    Cool Guy

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    The rings look pretty severely damaged compared to normal ones. I will replace them ASAP and if I have any more problems I will let you guys know!

    Thanks guys! :wavey:
     
  12. Glock19Fan

    Glock19Fan
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    Cool Guy

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    Well, I replaced the gas rings today and took it to the range. Upon charging it, I automatically got a feed issue. I cleared it, and actually fired 5 rounds in a row without issue. Then the same jam happened again.

    I did notice today that the bolt catch doesnt hold the bolt to the rear, although it does engage. Just not enough to hold it. Both with and without a magazine inserted. Would this have anything to do with it?

    The magazine seems to be in good condition, but I may try another magazine tomorrow. Other than that I am out of ideas.

    Anything else anyone can think of?
     
  13. mjkeat

    mjkeat
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    I have seen this before but can't remember the remedy though I do know how to avoid it. We won't get into that.

    Try a new mag and/or bolt.

    This might be the reason for such a great deal.

    EDIT: check the bolt lugs
     
    #13 mjkeat, Jan 22, 2013
    Last edited: Jan 22, 2013
  14. VinnieG

    VinnieG
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    We have had more problems with the brownell mags than any other. I agree with trying a different mag
     
    #14 VinnieG, Jan 22, 2013
    Last edited: Jan 22, 2013
  15. Glock19Fan

    Glock19Fan
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    Cool Guy

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    Well, some possibly good news. I placed the upper onto the lower from my other AR15. Bolt locked back perfectly with now problem. So now I think the problem may be in the lower.

    Anything to look out for on the lower? Possible buffer tube? I believe the magazine isnt the problem becuase I used it in my M4 with no troubles.
     
  16. Glock19Fan

    Glock19Fan
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    Well I may have found this issue. I put my Bushmaster lower and this Oly lower side by size. I noticed that the buffer spring tube on the Oly was about 1" shorter than the Bushmaster. Not only that, but I removed the actual buffer springs, and the Oly had a spring 1" longer than the Bushmaster (Shorter tube + longer spring = more tension?).


    What do you guys think about this? Should I try a shorter spring, or were the Olys springs made unusually long?
     
  17. Glock19Fan

    Glock19Fan
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    Cool Guy

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    Problem solved (maybe). I took the shorter spring from the Bushmaster and installed in the Oly. I assembled the rifle, charged it, and pushed the lock in and the bolt stayed back.

    Now to find a new spring. I looked briefly online but never seen any specific spring measurements. Would it be safe to cut the spring?
     
  18. vettely

    vettely
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    The most common cause of problems is usually magazine related. What happened when you tried several other mags?
     
  19. Apetrulis01

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    It could be a few things.

    - Wrong buffer
    - Bad Magazine
    - feed ramps (are they polished / are they m4 feed ramps)

    Those are just a few I could think of off the top of my head.

    Adam
     
  20. Glock19Fan

    Glock19Fan
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    I only used one magazine, but these are the same mags that worked flawlessly in two other weapons.

    I could be wrong, but I think a combination of bad gas rings and heavy buffer spring were cuasing the rifle to short stroke. I replaced the gas rings, and I will try to find a carbine spring tomorrow (or attempt to cut it a little shorter?). Hopefully this solves the problem. If nothing else I will take a serious look at the mags, but I am relieved that with the shorter spring from my Bushmaster the bolt was able to lock to the rear.