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Thread: AR Problems :( please help!

  1. #31
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    Quote Originally Posted by Quib View Post
    Good deal. So another BCG fixed the problem. Now if you wish, you can concentrate on finding the problem with the original bolt carrier group. Or just let the seller deal with it.

    Some possibilities;

    - Partially plugged carrier key?
    - Loose carrier key?
    - Out-of-spec carrier key?
    - Worn gas rings?
    Must be out of spec since it is brand new...

  2. #32
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    Quote Originally Posted by ColdDeadHands View Post
    Must be out of spec since it is brand new...
    Possibly. With the way companies are cranking out parts and rifles, I think QC has slacked a bit.

    I didn’t consider your carrier group being fairly new. By out-of-spec I had a used carrier key in mind. If the gas tube to carrier key fit is not exactly right, the gas tube can wear on the carrier key. Over time this elongates the carrier key gas passage causing excessive leakage.

    It could be an improperly drilled carrier key gas passage or partially blocked carrier key gas passage. I’m sure you probably already checked the carrier key for security. It could also be a poor carrier key to carrier fit, causing excessive gas leakage where the two mate up.

    You could still check the above. Now that you know for sure the carrier group is at fault, it should be a easy fix.
    “A leader is best when people barely know he exists, when his work is done, his aim fulfilled, they will say: we did it ourselves.” -Lao Tzu


    http://quibphotography.com/

  3. #33
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    Quote Originally Posted by Quib View Post
    Possibly. With the way companies are cranking out parts and rifles, I think QC has slacked a bit.

    I didn’t consider your carrier group being fairly new. By out-of-spec I had a used carrier key in mind. If the gas tube to carrier key fit is not exactly right, the gas tube can wear on the carrier key. Over time this elongates the carrier key gas passage causing excessive leakage.

    It could be an improperly drilled carrier key gas passage or partially blocked carrier key gas passage. I’m sure you probably already checked the carrier key for security. It could also be a poor carrier key to carrier fit, causing excessive gas leakage where the two mate up.

    You could still check the above. Now that you know for sure the carrier group is at fault, it should be a easy fix.
    Jcrowl (seller) from arf dot com is ordering a BCM Auto BCG for me and will have it shipped directly to me In return I will send him the faulty BCG so he can send it back to LMT for repair/replacement.

    Jcrowl is a standup guy, I never asked for anything but info on parts used but he apologized & suggested to get this Carbine fixed on his expense. Even tho this Deal wasn't made on this site I think it is worth mentioning because great guys like that are hard to come buy.

    Thanks for all the Help guys!

  4. #34
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    Quote Originally Posted by ColdDeadHands View Post
    Jcrowl is a standup guy......
    I agree. I’ve known him since he joined over there. He’s one of the good guys.

    Glad to see your getting things taken care of.

    Quib
    “A leader is best when people barely know he exists, when his work is done, his aim fulfilled, they will say: we did it ourselves.” -Lao Tzu


    http://quibphotography.com/

  5. #35
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    Quote Originally Posted by Quib View Post
    Good deal. So another BCG fixed the problem. Now if you wish, you can concentrate on finding the problem with the original bolt carrier group. Or just let the seller deal with it.

    Some possibilities;

    - Partially plugged carrier key?
    - Loose carrier key?
    - Out-of-spec carrier key?
    - Worn gas rings?
    Why would the BCG ride over the cartridge when released from a locked back condition?
    Especially since it was noted that the case head covered the lower lug of the bolt on inspection.
    Got to be more than a gas related issue.
    Glock Certified Armorer
    Armed Protective Services II

  6. #36
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    Quote Originally Posted by Quib View Post
    Possibly. With the way companies are cranking out parts and rifles, I think QC has slacked a bit.

    I didn’t consider your carrier group being fairly new. By out-of-spec I had a used carrier key in mind. If the gas tube to carrier key fit is not exactly right, the gas tube can wear on the carrier key. Over time this elongates the carrier key gas passage causing excessive leakage.

    It could be an improperly drilled carrier key gas passage or partially blocked carrier key gas passage. I’m sure you probably already checked the carrier key for security. It could also be a poor carrier key to carrier fit, causing excessive gas leakage where the two mate up.

    You could still check the above. Now that you know for sure the carrier group is at fault, it should be a easy fix.
    Which reminds me.
    Quib have you ever seen a spec/tolerance on what the diameter of the raised portion/nipple end of the gas tube should be?
    Ive seen some rather large differences in the replacement gas tubes recently.Some have a distinct raised ring and others not so much.In that regard some fit extremely tight in a gas key and others are flat loose.
    Glock Certified Armorer
    Armed Protective Services II

  7. #37
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    Quote Originally Posted by Blankwaffe View Post
    Which reminds me.
    Quib have you ever seen a spec/tolerance on what the diameter of the raised portion/nipple end of the gas tube should be?
    Ive seen some rather large differences in the replacement gas tubes recently.Some have a distinct raised ring and others not so much.In that regard some fit extremely tight in a gas key and others are flat loose.
    I’ve never seen a spec on the gas tube diameter.
    “A leader is best when people barely know he exists, when his work is done, his aim fulfilled, they will say: we did it ourselves.” -Lao Tzu


    http://quibphotography.com/

  8. #38
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    Quote Originally Posted by Blankwaffe View Post
    Why would the BCG ride over the cartridge when released from a locked back condition?
    I may have misunderstood this.

    I originally thought something might be lodged in his receiver extension preventing the bolt carrier from traveling fully to the rear. When he pulled on the charging handle he got the bolt back far enough to strip a fresh round. But, when the weapon fired, it could not travel back on its own far enough to strip a fresh round.

    It can be a task sometimes, trying to troubleshoot a weapon malfunction over the internet, without the weapon literally in front of you. All a person can do is try to interpret the individuals description of the malfunction, and start tossing out possibilities for a corrective action based off past experience.
    “A leader is best when people barely know he exists, when his work is done, his aim fulfilled, they will say: we did it ourselves.” -Lao Tzu


    http://quibphotography.com/

  9. #39
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    Quote Originally Posted by Quib View Post
    I may have misunderstood this.

    I originally thought something might be lodged in his receiver extension preventing the bolt carrier from traveling fully to the rear. When he pulled on the charging handle he got the bolt back far enough to strip a fresh round. But, when the weapon fired, it could not travel back on its own far enough to strip a fresh round.

    It can be a task sometimes, trying to troubleshoot a weapon malfunction over the internet, without the weapon literally in front of you. All a person can do is try to interpret the individuals description of the malfunction, and start tossing out possibilities for a corrective action based off past experience.
    I was perplexed myself and is why I did not respond initially...thought maybe you had previous experience with this type of situation other than what has been reported by the OP.
    Glock Certified Armorer
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  10. #40
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    Quote Originally Posted by Quib View Post
    Good deal. So another BCG fixed the problem. Now if you wish, you can concentrate on finding the problem with the original bolt carrier group. Or just let the seller deal with it.

    Some possibilities;

    - Partially plugged carrier key?
    - Loose carrier key?
    - Out-of-spec carrier key?
    - Worn gas rings?
    Would this BCG have the MIM gas key that generated so much traffic here earlier?
    Peace, Jerry

    I don't drink the koolaid

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