Ar jams every shot

Discussion in 'AR-15 Discussion' started by Nanookofthenorth, Aug 16, 2014.

  1. Nanookofthenorth

    Nanookofthenorth New Member

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    Stag Arms Model 3, completely stock except for thordsen customs NY legal stock. I clean the gun nearly every time I go shooting, but the last 2 times I have went shooting I've had to rack the action every time and its not a normal smooth ejection its tough and forced. It fires, the bolt comes back just a little and the case has to be rough ejected by hand. What gives?
     
  2. MisterMcCool

    MisterMcCool Well-Known Member Supporter

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    Are you using low recoil ammunition?
     

  3. Mercator

    Mercator Active Member

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    Reloads? East Europeen'?

    Tried another mag?

    Didn't grease the gas tube? Bolt reassembled correctly?
     
    Last edited: Aug 16, 2014
  4. Nanookofthenorth

    Nanookofthenorth New Member

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    Gas key was loose... put threadlocker on the bolts in it and put it together, will let you know how it goes at the range. Thanks guys
     
  5. Sgt_Skrb_25

    Sgt_Skrb_25 New Member

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    You need to stake the key screws in. Thread lock will give out quick on the key.


    Sent from my iPhone using Firearms Talk
     
  6. Sniper03

    Sniper03 Supporting Member Supporter

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    I guess first of all if you have been shooting cheap ammunition that has varnish on it your chamber is filled with varnish causing the cycle to be short.

    If when you pull the charging handle back you feel a significant amount of resistance there may be debris in the trigger area. Or something is going on with the stock.

    If it is a full length stock is the screw too long striking the buffer Nylon? If so it will leave a contact mark on the center of the nylon of the buffer. Is the Extension Tube Spring the correct one? (Buffer Tube)

    Is it hard to insert a magazine with the bolt closed which could occur by a damaged magazine and it's lips.

    But as stated a loose Carrier Key is in most cases the problem if the gun has been running good in the past! *Do Not Use Thread Locker! If it is loose take it off clean all areas and reinstall it. Then stake the screws! It is easier if you stake the Carrier Key Screws with a Center Punch coming straight down on it and in a triangle staking pattern around the screws. I will be glad to send you a picture of the locations.
    On a very rare occasion a screw can break on the Carrier Key causing it to flex up and allow gas to escape when the weapon is fired. To check it just take a hex took and attempt to tighten the screw underneath the staking. If it clicks when you attempt to tighten it you have a broken screw. Once again remove, clean, use a new screw and stake it.

    Lastly would you have happened to put a weaver style gas block on it and cut off part of your gas port in the barrel? Only a thought! Happens very often.

    Check out the above and let us know!

    03
     
    Last edited: Aug 26, 2014
  7. Nanookofthenorth

    Nanookofthenorth New Member

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    Sniper,

    Gas key vibrated loose tightened it down with thread locker, works great I'll see how the thread locker holds up. If not I'll just get a nickel plated carrier as I should anyway
     
  8. Nanookofthenorth

    Nanookofthenorth New Member

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    PS: the screws are staked which is another reason why I am confused how it came our
     
  9. Sniper03

    Sniper03 Supporting Member Supporter

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    Nannook,

    In the past there was one company that starts with a B that was notorious for not getting their Carrier Key Screws staked enough to keep them tight.
    When we tought the carbine instructor schools as we still do. It never failed that we had one or two of their rifles carrier keys come loose. SO we started checking all the rifles the first day of class and restaking them if needed. The reason we do not recommend thread locker is if the thread locker holds up to heat first and secondly if it does and a screw breaks in the carrier they can give issues removing the broken section. None of the major manufacturers use thread locker on the screws that is what the staking is suposed to take care of. But to each his own and if it works for you you are good to go!

    03
     
  10. Nanookofthenorth

    Nanookofthenorth New Member

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    Thanks a lot, I'll just deepen the stake clean the thread locker off.
     
  11. fsted2a

    fsted2a Active Member

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    My advice, which is based on training I got from a Colt armorors course a few years back, is every time you remove the gas key screws, throw them and the gas key away and start with a new set. If you stake it once, odds are you will never get it back in the same position again, and if it is staked halfway decent, you will eff up the screw heads upon staking. Just one of those things where you are better safe than sorry. Do it right and be done with it, otherwise, you may be fooling with this problem again and again.