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Help AR will not cycle

Discussion in 'Maintenance & Gunsmithing' started by crfreaks, Sep 11, 2015.

  1. crfreaks

    crfreaks New Member

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    My AR will not auto cycle, I have to Manually cycle it after i shoot. I am not sure what the issue is i lent it to a friend and this is how i got it back.. I have gone through and can not find a issue,,
     
  2. Joe13

    Joe13 NW of Vancouver Opinionated & Blunt Bronze Supporter 2015 Volunteer 2016 Volunteer

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    Gas or piston?

    Is the gas block still aligned?

    I assume its been cleaned;)
     
  3. crfreaks

    crfreaks New Member

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    It's a gas system, Anderson AR.
    I have clean it, the collector on the bolt was lose so I tighten it up. Gas tube is clear.
     
  4. Garg

    Garg east of portland metro Hold my beer..... watch this Bronze Supporter

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    What is a collector that is on the bolt? Are you talking about the gas key?
     
  5. crfreaks

    crfreaks New Member

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    Sorry Gas Key not collector. Auto Correct hate it..
     
  6. Garg

    Garg east of portland metro Hold my beer..... watch this Bronze Supporter

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    9 out of 10 times, when an AR will not cycle, it turns out to be gas system related. If the gas key is coming loose, that is bad. It should be staked, and not come loose. The usual suspect, (IME) is the gas block. Misaligned, or blocked, or loose.
     
    Lange22250 and oli700 like this.
  7. rick benjamin

    rick benjamin USA, Or, Damascus Secure the drama Silver Supporter 2016 Volunteer

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    Garg is on the money.
    Gas key loose on an Anderson upper??
    What was your friend doing to/with your gun? (retorical question)
    387bf-ar15-gasimpingement.gif
    http://kr-15.com/2014/01/09/how-does-an-ar-bolt-work/
    Cleaning an Anderson
    Carrier gas key clogged/damaged?
    Gas tube clogged/bent/damaged?
    Front sight post gas block clogged, mis-aligned?
     
  8. Velzey

    Velzey Estacada, Oregon Gunsmith Gunsmith Bronze Vendor Bronze Supporter

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    If your gas key was loose, your were losing all your operating pressure!
    Tighten it up and properly stake the bolt heads so this won't happen again!
     
  9. v0lcom13sn0w

    v0lcom13sn0w Keizer, or Well-Known Member

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    gas block probably is loose and or mis aligned or your gas rings are worn. or both.
     
  10. Garg

    Garg east of portland metro Hold my beer..... watch this Bronze Supporter

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    Could also be a bent gas tube. I would just take the whole thing apart, and replace the tube.
    They are cheap.

    Edit, as an aside, that would be the last time I would loan that guy an AR LOL
     
  11. crfreaks

    crfreaks New Member

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    Yep that is the last time i ever do that again.
     
  12. OFADAN

    OFADAN Brownsville, OR Well-Known Member

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    Depending on the model, some Anderson's and ATI who use the same style/type are having loose gas blocks. Been experiencing this in carbine courses of late. Some become loose after a few rounds on day one, others toward the end of day two and some right out of the box. Don't ask me how I know this!! This is an easy check and correction.
     
    Last edited: Sep 22, 2015
  13. Garg

    Garg east of portland metro Hold my beer..... watch this Bronze Supporter

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    I have never had an Anderson BCG, so I have never experienced it. Come to think about it, I have never had a gas key come loose yet. I guess I am just a noob :)
     
  14. OFADAN

    OFADAN Brownsville, OR Well-Known Member

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    If manufactured and assembled correctly the key should be held in place with grade 8 Allen screws torqued to 35-40 inch pounds and properly staked with a staking tool to mil spec requirements. If done correctly you most likely won't see this happen.

    I'm unaware of Anderson having any key and/or BCG related problems. Only seeing the gas blocks not properly torqued and lack of using a hi temp screw/bolt adhesive thus gas blocks using Allen head screws coming loose.​
     
    Last edited: Sep 15, 2015