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Thread: Colt M4 Ejecting Into Receiver

  1. #1
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    Colt M4 Ejecting Into Receiver

    Has anyone experienced this with a new Colt M4? A friend of mine just contacted me when this happened to one of the Marines he was training. The Marine had managed to install the bolt in the carrier with the extractor facing the opposite direction of the ejection port. When the bolt was checked (new from the armory by the way) the cam pin could be inserted from either side and no bevels were present. Just want to know if anyone else has come across this particular problem recently.

    I will post some pictures as soon as I figure out how to get them off of my phone.

  2. #2
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    Yes I have heard and seen this happen and yes, it was 100% user/builder error on inserting the bolt in the wrong way when reassembling the BCG.
    Quote Originally Posted by Coal Dragger View Post
    Marines love CLP. Chow, libo, pussy.

    Beyond that everything else is a crap shoot.

  3. #3
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    Was this on an actual military Colt M4 or M4A1, or something different? I'm only interested in experiences with issued hardware.

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    how the hell does that happen? I dont think you can put it togher that way
    "After I shot myself, my training took over and I called my parents..." Texas Grebner

    "Take me with a grain of salt, my sarcasm does not relate well over the internet"

    Jonathan Morehouse

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    Quote Originally Posted by ICANHITHIMMAN View Post
    how the hell does that happen? I dont think you can put it togher that way
    Right, definitely shouldn't be able to; but my friend alluded to a possible new design change that somehow allows this to happen.

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  7. #7
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    I highly doubt that Colt would make a design change for exactly this reason. It has to be a defect and needs to be reported ASAP.

    IIRC the original M16's had a bolt that would allow the cam pin to go in either way and it was changed for exactly this reason.



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  8. #8
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    That is a bad bolt if you can install the cam pin the wrong way.
    B.A.S. Mechanical Engineering Technology

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    Quote Originally Posted by Iraqgunz View Post
    I highly doubt that Colt would make a design change for exactly this reason.
    My thoughts exactly.

  10. #10
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    I've had it pop up a few times over the years.
    It happens. User error and inspection fail.
    Still, usually impossible to do.
    Jack Leuba
    Director, Military and Government Sales
    Knight's Armament Company
    jleuba@knightarmco.com

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