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Thread: Can anyone help with this malfunction?

  1. #21
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    Quote Originally Posted by TF82 View Post
    I recently aquired a used Colt 6721....

    This happened only when hand cycling the action, never from a locked back bolt. ...

    Also, after changing the gas rings, if I rode the charging handle on the gun while empty the bolt would not fully go into battery but would once I pushed the charging handle the rest of the way forward...

    I missed a few things on first reading as well.

    Charging handle?

    Mags seating too deep in the lower?

    M4 feed ramps on a rifle profile barrel?

    Does this happen when there is more than one round in the mag?

    lube the carrier riding surfaces?
    Sticks

    Grasseater // Grass~eat~er noun, often attributive \ˈgras-ē-tər\
    A person who is incapable of independent thought; a person who is herd animal-like in behavior; one who cannot distinguish between right and wrong; a foolish person.
    See also Sheep

  2. #22
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    The firing pin will hit the primer when cycling the bolt. However typically does not hot with enough force to ingnite the primer. Look at the rounds you "cycled" and see if you can see the small indent on the primers.....
    ETC (SW/AW), USN (1998-2008)
    CVN-65, USS Enterprise

  3. #23
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    Quote Originally Posted by TF82 View Post
    Soooooo, have any of you had a moment when you realized you were probably an idiot? I did. I think markm is right and it sits just fine with me because I'm not really the sensitive type and it's free.

    The more I thought about it I realized that, while I knew that cycling rounds through the magazine is not the same as shooting, it is also not the same as chambering a round from the magazine to put the rifle into action, which is what I meant by "doing it all the time." I tried putting all the new parts back in and, from an empty chamber, charging with the charging handle. I then removed the magazine, ejected the round and repeated until I emptied the new Colt magazine. There were no issues. So it seems like the only problem may be with me. I'm pretty happy about that being the case because I was thinking I should probably just unload this thing and pick up a sweet LWRC.

    I am left with one question, why would cycling the action cause a negligent discharge?


    Hah, well, glad you made progress on pinning down the issue.

    As for an ND, my thoughts on it, when you use live ammo for function testing it introduces the opportunity for it to be fired off simply due to a brain fart.

  4. #24
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    It's your BCG. Or maybe all that caked on carbon fouling... good god man... clean your rifle...
    Last edited by Shao; 01-18-13 at 18:04.

  5. #25
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    Yeah the bolt not closing on empty only happened when I really eased it closed and pushing the charging handle forward until it latches let's the bolt closed. After all the cycling I've been doing I can't get it to do that anymore. I didn't think it was really an issue but I wanted to give a full report. Has anyone experienced a discharge when cycling the action? Thanks for the help everyone, even though I may have just wasted a lot of your time.

  6. #26
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    Quote Originally Posted by TF82 View Post
    Yeah the bolt not closing on empty only happened when I really eased it closed and pushing the charging handle forward until it latches let's the bolt closed. After all the cycling I've been doing I can't get it to do that anymore. I didn't think it was really an issue but I wanted to give a full report. Has anyone experienced a discharge when cycling the action? Thanks for the help everyone, even though I may have just wasted a lot of your time.
    Sounds like it corrected itself. The above suggestion of cleaning?

    I'd take a look at the gas tube and carrier key to make sure it's not tweaked and causing the binding [past tense].

    As for firing when cambering, not that I know of, but it is a possibility if the ammo has soft primers. Double your chances with a dirty weapon if the firing pin gets bound in the forward position by carbon chunks or other grit. Why repeatedly take the risk?

    Kind of a general rule to not mix live ammo and weapon tinkering at home at the same time. I reload, so I have all the dummy rounds I want for this kind of thing.
    Sticks

    Grasseater // Grass~eat~er noun, often attributive \ˈgras-ē-tər\
    A person who is incapable of independent thought; a person who is herd animal-like in behavior; one who cannot distinguish between right and wrong; a foolish person.
    See also Sheep

  7. #27
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    Quote Originally Posted by Sticks View Post
    Sounds like it corrected itself. The above suggestion of cleaning?

    I'd take a look at the gas tube and carrier key to make sure it's not tweaked and causing the binding [past tense].

    As for firing when cambering, not that I know of, but it is a possibility if the ammo has soft primers. Double your chances with a dirty weapon if the firing pin gets bound in the forward position by carbon chunks or other grit. Why repeatedly take the risk?

    Kind of a general rule to not mix live ammo and weapon tinkering at home at the same time. I reload, so I have all the dummy rounds I want for this kind of thing.
    If you look at how the bolt works, it is impossible for it to be stuck in the forward position. The bolt actively pulls the firing pin back when the bolt unlocks. Repeated chambering of rounds can also damage the internals of the primer, from the firing pin hitting it, causing a dud round.

  8. #28
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    Quote Originally Posted by TF82 View Post
    Yeah the bolt not closing on empty only happened when I really eased it closed and pushing the charging handle forward until it latches let's the bolt closed. After all the cycling I've been doing I can't get it to do that anymore. I didn't think it was really an issue but I wanted to give a full report. Has anyone experienced a discharge when cycling the action? Thanks for the help everyone, even though I may have just wasted a lot of your time.

    I have not. I learned on 1911s where hammer follow is a possible malfunction and it is a safety check. So diagnosing any issue is done with dummy rounds or nothing at all.

  9. #29
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    Quote Originally Posted by michael word View Post
    If you look at how the bolt works, it is impossible for it to be stuck in the forward position. The bolt actively pulls the firing pin back when the bolt unlocks. ....
    Kind of a miss statement. The bolt moves away from the firing pin when it unlocks. Still slight potential for the pin to be wedged against the firing pin retainer or in the carrier. In actuality it will just damage the primer rather than firing the round, but weird shit does happen.
    Sticks

    Grasseater // Grass~eat~er noun, often attributive \ˈgras-ē-tər\
    A person who is incapable of independent thought; a person who is herd animal-like in behavior; one who cannot distinguish between right and wrong; a foolish person.
    See also Sheep

  10. #30
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    Quote Originally Posted by Shao View Post
    It's your BCG. Or maybe all that caked on carbon fouling... good god man... clean your rifle...
    Yeah, that upper is asking for a few shots of brake cleaner.

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