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Thread: Need help diagnosing problem.. bad bolt?

  1. #1
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    Need help diagnosing problem.. bad bolt?

    Hey guys,
    Just went out to the farm to try out my freshly finished build.
    I am having problems even firing a round once chambered in.
    Once the round is chambered in, I pull the trigger, no boom.
    *PLEASE NOTE: I HAVE USED THE FOLLOWING AMMO WITH ALL THE SAME RESULTS;
    • Hornady
    • Federal
    • Winchester
    • Eagle
    • Monarch
    *

    When I swapped BCG's with my buddy, the AR performed flawlessly (and did not leave any deformed brass like in the picture!)
    As shown in picture 1, there is a strike mark on the round. Sometimes it is a decent looking strike mark and other times it is a very weak one.
    Here is one of the many brass I had attempted to fire;

    Here is a couple of steel cased poop ammo attempted to fire:


    *On the RARE occasion that a round actually fires, when I go to pick up the brass on the ground it has abnormal DENTS in the brass where the bullet was seated in the casing!* (See picture)
    We're talking a 1/15th of a chance that one fired.. the casing looked un reloadable... like this:


    The one on bottom is my BCG:

    I know this is a great forum and I'm looking for enlightenment!
    Any help would be greatly appreciated I would love to be able to get running again before the weekend!
    Last edited by Ostdarva; 05-23-13 at 23:13.

  2. #2
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    Re: Need help diagnosing problem.. bad bolt?

    If you swapped BCG's and everything worked fine then I think you found the issue.

    What kind of BCG are you using and did it work in a previous rifle?

    Sent from my SGH-T999 using Tapatalk 2

  3. #3
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    bought it brand new..
    what i'm trying to figure is what would cause such a problem like bad strikes and the brass being messed up is it the ejector/firing pin?
    (going to use knowledge acquired when purchasing future bcg's)
    Last edited by Ostdarva; 05-23-13 at 23:18.

  4. #4
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    Have you tried cleaning the firing pin and channel?

    Did you remove the shipping preservative and put REAL gun lube on it?
    My brother saw Deliverance and bought a Bow. I saw Deliverance and bought an AR-15.

  5. #5
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    Re: Need help diagnosing problem.. bad bolt?

    Where did you buy the BCG and what kind is it?

    Sent from my SGH-T999 using Tapatalk 2

  6. #6
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    Where is the channel located?
    I lube and clean my guns religiously.
    Every day they are fired they are cleaned and lubricated immediately following.
    Last edited by Ostdarva; 05-23-13 at 23:26.

  7. #7
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    Quote Originally Posted by Ostdarva View Post
    Where is the channel located?
    I lube and clean my guns religiously.
    Every day they are fired they are cleaned and lubricated immediately following.
    The tunnel the firing pin sits inside

  8. #8
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    Not all bolt carriers and bolts are created equal. It is very likely not your carrier as the firing pin travel is limited by the bolt itself. You either have a firing pin issue or a bolt issue. You can replace parts one at a time to check or get yourself a firing pin gauge. The other possible issue, I suppose, would be a headspace issue with your bolt.

    Please tell us the make of your parts.

    BTW, the dents in the case mouth are very likely to not be related to your other issues. However, they are entirely reloadable.
    Last edited by AKDoug; 05-23-13 at 23:29.

  9. #9
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    Bought it at a store.
    Already told that they will fix the issue. But I am here to find out what can cause this and what to look for in a bad bolt or whatever issue this may be.
    Unaware of the make.

    Only know that it is carpenter 158
    "properly" Staked, M inspected ect.

    I can upload pictures if need be.
    Please advise.

    Thank you,

    Darva
    Last edited by Ostdarva; 05-23-13 at 23:31.

  10. #10
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    Remove the bolt. Make sure the bolt tail is clean. Check to make sure the shoulder on the firing pin is clean.

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