AR15 jam/stovepipe

Discussion in 'AR-15 Discussion' started by colecross, Nov 25, 2012.

  1. colecross

    colecross New Member

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    Bought a brand new AR this year, put about 700 rounds through it before I started experiencing stovepipe jams, bolt, extractor, ejector, buffer spring, buffer, ammo, is all good. The only thing I could find online was that the bolt carrier may be moving too far into the buffer tube and that a possible fix could be to put shims (quarters) in the buffer tube behind the buffer spring making the bolt stick past the ejection port about a 1/4 inch instead of the bolt being flush with the extraction port. Please give me your thoughts on this idea, I will be trying it out next week.
     
  2. robocop10mm

    robocop10mm Lifetime Supporting Member Lifetime Supporter

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    NO NO NO!!! If it needed shims, Gene would hve put them there. Most likely source is a loose gas key. Check the two allen screws (40 INCH pounds, Really), and stake the screws.

    Lemme guess, Bushmaster? They do not stake the gas key screws and this happens all the time.
     

  3. colecross

    colecross New Member

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    It's a red x arms 16" upper and a spikes tactical lower, the gas key it tight and staked. I've tried swapping bolt carriers, putting a different upper on my lower and it still resulted in a stovepipe that's when I looked into possible problems with the buffer, a lot of people including red x arms are telling me to try a H2 buffer but from what I've read this wont fix my problem just slow it down.
     
  4. SSGN_Doc

    SSGN_Doc Well-Known Member

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    Actually the H2 may help by slowing the carrier down enough to allow ejection to occur before the bolt is too far to the rear. Also slowing the bolt carrier down may prevent that over travel and bolt bounce back forward.
     
  5. colecross

    colecross New Member

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    I'm 95% sure that the over travel of the bolt carrier group is the issue. But I still need to fix it, if the shims and/or the h2 buffer doesn't work, I'm wondering if there was a way to make the buffer tube screw into the lower receiver farther to prevent over travel?
     
  6. purehavoc

    purehavoc New Member

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    you dont by chance have a rifle length spring in that buffer tube do you , I have seen it happen , just a thought
     
  7. Quentin

    Quentin New Member

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  8. purehavoc

    purehavoc New Member

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    almost sounds like your undergassed if you ask me . Your not getting enough gas to extract the shell but just enough to pick up the next round , Heres a few things I would be looking at , Pull bolt, check extractor spring and see if it has a rubber insert , check ejector spring and make sure its in good shape , if it continues I would tell you to remove one weight out of the buffer and retry, I dont suggest shooting it like this but just do it as a test . I dont think a heavier buffer is going to fix your problem if you do have a under gassed situation . If it does fix the problem I would be checking the gas port for obstructions
     
  9. AgentTikki

    AgentTikki New Member

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    Have you checked your gas rings? I once had to change mine out at 500 ish rounds. My gun wouldn't cycle Wolf, but would M193. When I found the rings to be an issue, i swapped it out and voila, it cycled Wolf afterwards.
     
  10. Quentin

    Quentin New Member

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    Until the OP answers my question I'm still suspecting magazines and maybe ammo, after all he did say he's had stovepipes with two uppers and possibly two BCGs.

    And when it comes to AR malfunctions the first word in MEAL is Magazines. Ammo isn't far behind.

    To be fair, it isn't clear if he used two bolts, he just said carrier, so the extractor could still be in play.

    And Lube! :D
     
    Last edited: Nov 27, 2012
  11. purehavoc

    purehavoc New Member

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    Good call Q I guess I skipped over the part about 2 uppers . mags could be the problem but that shouldnt cause the first round to not eject , but hey I have seen some pretty strange sh!t on these in the last 12 months of owning ARs . I still suspect the extractor spring may be weak , chipped extractor or maybe just needs the rubber insert if it doesnt already have one
     
  12. jjfuller1

    jjfuller1 New Member

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    NO, NEVER! shims, are in no way a fix to what the problem is. just dont do it!
    you've tried 2 uppers, so its not the gas port.
    you tried to BC's so its not that.
    you didnt say if you tried 2 different bolts.
    and you didnt say if you tried different ammo, or mags.

    also could be the extractor,
    or the buffer spring.

    you can swap the bolt itself first.
    if theres still a problem buy a new wolf buffer spring.

    perhaps, you could post pics of the rifle. maybe any jam that happens. also pics of the buffer, n spring.
     
  13. purehavoc

    purehavoc New Member

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    Why is it I just feel like this one has a rifle length spring in a carbine tube? Didnt I say that in a above post ? :D
     
  14. Quentin

    Quentin New Member

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    Very possible since this sounds like something wrong in the lower. But we just don't have enough info from the OP. Don't know much about this rifle so far.
     
  15. colecross

    colecross New Member

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    I have tried swapping bolts and I'm using federal 5.56 x 45 not reloads, no wolf ammo, I've tried two different 30rd pmags. I have no idea how to tell if the spring is a carbine length or rifle length spring.
     
  16. Jpyle

    Jpyle New Member

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    Take some pics of the rifle and post them here...that will help identify the type of stock and buffer tube you have...then measure the buffer spring. A carbine spring will be shorter that a rifle length spring. (see below). Putting the wrong spring and buffer in the tube will lead to cycling issues. You can use either buffer system as long as all the parts are of the same type system, i.e. a rifle length (A2 style) extension type will require a rifle length spring and a rifle system buffer...same goes for carbine setups.

    gotta love the internet....:D

    [​IMG]
     
    Last edited: Dec 1, 2012
  17. colecross

    colecross New Member

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    Today I went to the range to try the shim idea for the first time, and it worked! I blew off 400rds with not a single jam, but I will still check the buffer and spring to make sure I don't have the wrong one. Thanks!
     
  18. canebrake

    canebrake New Member

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    You're fixing the symptoms, NOT the problem.

    Listen to my guys! [​IMG]
     
  19. fsted2a

    fsted2a Active Member

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    I don't even like to shim starters.:eek: They don't come from the factory shimmed. Shimming something that goes boom deliberately is a bad idea.