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Thread: Need help diagnosing problem.. bad bolt?

  1. #21
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    Google AR15 hammer spring and it should pop up. I had someone build my lower and the spring was installed backwards. I didn't find out till yesterday when my AR was having light strikes/FTF.
    Custom pimp my Orange County Overhauled American Sons of Enhanced M4gery Game Changa Neva Been Done Befo piston driven Tactikul Desert Carbean with its own mags

  2. #22
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    If it functions properly with another BCG, it's not your hammer spring.

    Now you need to do selective swapping with the known BCG. First try the good bolt in the bad BCG. Then, if that works try the bad firing pin in the aforementioned setup and so on. If the good bolt doesn't work in the bad BCG, that is a clue. You will quickly find the problem.

  3. #23
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    Good to know.
    It's most likely going to take some time before they can get to me to swap the bcg so I will be hitting the range immediately after work to continue diagnosis.
    Range report to follow!

    Thanks everyone

  4. #24
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    Quote Originally Posted by Ostdarva View Post
    HEY THERE! Uncle Money Bags!!!
    How ya doin man
    Hey dude.

    I have a hunch, try something out for me if you would.
    With the bcg out of the weapon, close up the bolt in the locked position and push the firing pin from the rear causing it to protrude from the bolt face.
    Does the pin protrude about one mm and is there a gap between the firing pin and the firing pin hole?

    Im about 98% sure it wont be protruding far enough and that it is either the pin not being spec, or the bolt is holding it up.
    " If i cannot be a good example Lord, let me be a terrible warning"

  5. #25
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    Listen to Uncle Money Bags

    You haven't shown the bolt removed from the carrier. As stated above, keep trying swaps if possible to determine which part is not working for you.

    Simplest thing to try is a different firing pin, then the bolt only from the borrowed carrier group that functioned for you.

    By all means clean the channel in the bolt itself to allow full travel for the firing pin, you are only .010" away from success!

  6. #26
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    Alright,
    So I took apart the BCG.
    There was a lot of build up from junk on the extractor.. which I have no idea how that happens because the damn thing has only successfully fired like 15 rounds.
    ANYWAYS, I did a full field strip of it, did a very detailed clean and assembled it back together... took it to the range and NO LUCK.
    I could not change out the minor parts with my buddy because he could not make it out to my range in time to go shoot today. We will most likely be going to the range tomorrow.
    Here are the pics of everything:
    (For you uncle, bolt pushed in with me NOT PUSHING the back end of the firing pin)

    (For uncle, this is a pic of the bolt pushed in WITH ME PUSHING the back end of the firing pin)



    -------------------------
    The following pics are of everything stripped;

    Extractor.



    Inside of bolt after extractor removed:
    Last edited by Ostdarva; 05-24-13 at 21:37.

  7. #27
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    Without a firing pin protrusion gage you are spinning your wheels. You need to get another BCG and swap parts out.

    You should also try that BCG in another upper (if you haven't already). Otherwise you will just keep chasing your tail without getting anywhere.



    Owner/Instructor at Semper Paratus Arms

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  8. #28
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    Is it just the photo or is the end of that bolt tail not square?

  9. #29
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    I thought it was an optical illusion. It's hard to say.

    Quote Originally Posted by AKDoug View Post
    Is it just the photo or is the end of that bolt tail not square?



    Owner/Instructor at Semper Paratus Arms

    Facebook: https://www.facebook.com/SemperParatusArms/

    Semper Paratus Arms AR15 Armorer Course http://www.semperparatusarms.com/cou...-registration/

    M4C Misc. Training and Course Announcements- http://www.m4carbine.net/forumdisplay.php?f=141

    Master Armorer/R&D at SIONICS Weapon Systems- http://sionicsweaponsystems.com

  10. #30
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    As mentioned, swap part by part to narrow in on the problem. I would start with the firing pin and hope that's the problem. Then Swap the bolt, and then try the carrier with your bolt.

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