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Thread: Need help diagnosing problem.. bad bolt?

  1. #31
    Join Date
    Aug 2012
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    I asked him to check the protrusion in case it was obviously short. You dont need a gauge for that. Considering he didnt have another bcg at the moment to swap out parts, it is a reasonable thing to check.

    Having said that, the advice to find another bcg to change out parts; one at a time, is your best bet.

    The tail on that bolt does look funny. Is it angled?

    If you cannot come up with another bcg quick let me know and i will hook you up for troubleshooting purposes.
    Last edited by uncle money bags; 05-25-13 at 00:27.
    " If i cannot be a good example Lord, let me be a terrible warning"

  2. #32
    Join Date
    Jan 2008
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    AZ-Waging jihad against crappy AR's.
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    Let me recap an incident in Tucson a couple of years back (2011?) at a Magpul course. One of the patrol sgts. from a local PD's started having malfunctions at around 2200 rounds (or so).

    It was a Stag Arms 10.5" upper receiver group with Stag Arms BCG. I was racking my brains and couldn't figure it out, so I broke out my gage set. When I checked the firing pin protrusion and the firing pin hole both of them failed. We replaced the bolt and firing pin and it then ran flawlessly thereafter. So within a few thousand rounds the BCG failed.

    Had I not brought my gages, we would have never found the issue and would have had to go through multiple steps to troubleshoot. There was visually no way to see this.

    For reference the No Go (Min.) and Go (Max.) should be .028 and .036.



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  3. #33
    Join Date
    Mar 2013
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    Problem solved.
    Cleaned extractor sitting, replaced extractor and firing pin.
    Works like a charm and I don't get a deformed brass ejection either!
    Thank you everyone for your help!
    Finally got to sight in my new scope this weekend!

  4. #34
    Join Date
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    Thank you for the follow up

    It helps for those learning or perhaps with a similar issue down the road.

    Very happy for you it was a simple fix, they usually are!

    Now go out and wear it out.

  5. #35
    Join Date
    Jul 2011
    Location
    Montana
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    Those cases are all reloadable!

    Quote Originally Posted by Ostdarva View Post
    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!

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