AR would not cycle certain ammo, now it's double feeding

Discussion in 'Rifles' started by sobi1998, May 10, 2017.

  1. sobi1998

    sobi1998 Active Member

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    I've had some problems with my AR-15 lately. It happened a while ago but then I thought I had fixed it for good u till this past weekend. It would cycle m855 or typical .223 FMJ but I run hornady vmax .223 and the gun wouldn't cycle. I adjusted some things around on the gas block and cleaned the BCG real good and now it's stove piping and double feeding...
    All I did to the gas block was properly align it back onto the dimple
    What do y'all think?
    Im pretty certain the extractor is fine because it wasn't doing this before and I physically checked it to be sure


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  2. Dawico

    Dawico TGT Addict

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    The obvious question, have you tried different magazines?
     
  3. sobi1998

    sobi1998 Active Member

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    Yeah. I interchange magpuls and aluminums


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  4. txinvestigator

    txinvestigator TGT Addict

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    gunsmith
     
  5. Bozz10mm

    Bozz10mm TGT Addict TGT Supporter

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    It doesn't happen very often, but check to see that the ejector pin is in good condition. Mine chipped and caused the same problems you are having.
     
  6. ed308

    ed308 Well-Known

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    Make sure nothing is in the ejector hole, check the ejector and the spring, check the extractor, check an clean the bolt tail of carbon, and try different mags. If an adjustable gas block, make sure it's clean. And by all means, make the gas block hasn't come loose and shifted.
     
  7. sobi1998

    sobi1998 Active Member

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    So let's assume my extractor/BCG and gas block are in order. Would that be a buffer issue? As in, over gassed and has to be slowed down?


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  8. Bozz10mm

    Bozz10mm TGT Addict TGT Supporter

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    Assuming all the other things are in working order doesn't leave much else to look at. What buffer are you using now? How are the cases ejected, as in how far are they thrown? What angle?

    What grain V-max are you shooting btw?
     
    Last edited: May 11, 2017
  9. ed308

    ed308 Well-Known

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    If everything else is fine, then I'd look at the mag due to your note above. The buffer would likely have been a problem from the beginning. Could also be ammo related. Some ammo may not cycle an AR due to being underpowered due to the gas port on the barrel. Sounds like it's a gas problem to me, but I try different mags to rule them out of the problem. But inspect the bolt and the bolt closely. I've got a PSA 6.8 that's like clockwork and starts having cycling problems every 300 rounds of so. I have to scrap the carbon off the bolt tail to make it run smooth.
     
    Last edited: May 11, 2017
  10. ed308

    ed308 Well-Known

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    One more thought, check the gas key on top the BCG and make sure it's not loose.
     

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