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Thread: New stoppage encountered today... for me at least

  1. #1
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    New stoppage encountered today... for me at least

    First time I have experienced this one.

    We were running drills today, one of my students transitioned to his handgun, and finished the drills running his pistol. Once I called the line cold, he called me over to him.

    The bolt was stuck fully to the rear, in the open position. Charging handle was inoperable... Chamber clear, no bolt over brass, etc.





    Bottom line, I could not for the life of me, see what the issue was. In the end, had to disassemble the rifle. Got out my tool kit, took off the stock, castle nut, removed the buffer tube, being careful since the buffer spring was compressed.

    Once I got the buffer tube assembly off the rifle, I pushed the bolt forward and felt resistance. Looking all over the place with my pen light... I found the culprit.



    Primer unseated out of the cartridge, and lodged between the bolt and the upper receiver. Very interesting stoppage... made the MIGHTY COLT stop in it's tracks.

    I don't know if this is the proper forum for this post, if not... my apologies. I just wanted to share this stoppage.

    I have encountered blown primers falling into the fire control group, but never wedging up between the BCG and the Upper Receiver.

    Also, the operator was running iron sights for this drill.
    Last edited by DMack; 02-02-11 at 21:59.
    ----------------------------------------------------
    SGT Steven McGovern KIA - Iraq 21 APR 05.

    A friend, a brother, a true quiet professional. You will NEVER be forgotten.

  2. #2
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    Intriguing. Thanks for sharing and the pics.
    Would any sort of remedial action have cleared this or was it stuck so stiff that only your disassembly could free the BCG? What brand/type of ammunition was being used? Reloads?

    "Addressing the problem of shootings by ban or confiscation of non-criminal's guns is like addressing the problem of rape by chopping off the Johnson of everyone who DIDN't rape anyone while not only leaving the rapists' equipment intact, but giving them free viagra to boot." --Me

  3. #3
    Dano5326 Guest
    Did you see where the bind point was?

    Loose primers are notorious for gumming up trigger groups. Tight chambers (non 5.56) increase pressure and exacerbate these issues.

    Shit ammo doesn't help either.

    Neato, a new one for the book

  4. #4
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    I have had a few those happen in Iraq. A few were Bushmasters and one was a Colt.

    The Bushmasters had tight chambers which was causing the primers to blow.



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  5. #5
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    I had this happen to me several years ago with crappy M855. If I can recall, it was a colt BCG in a less than spec chamber.
    "Perfect Practice Makes Perfect"
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  6. #6
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    The chamber pressure of this round is so high that it is right on the edge of doing this sort of thing on a regular basis. The higher environmental temps of Iraq are a contributing factor. This environmental temperature influence on the pressure of the round has been known to hunters in equatorial Africa for many years. We have sacrificed a significant degree of reliability to gain another 50 meters of effective range. If I were king, I would order the chamber pressure of 5.56 to be reduced by 10%.

    Un-crimped primers and reloaded ammo are the worst offenders. Use only crimped primer factory ammo for critical situations.
    Dave

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  7. #7
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    This is an agency rifle, and the operator was using old M193 (SS109) 5.56 ammo. The cartridge case was stamped for Lake City, and according to the operator, was old training ammo that they brought to "burn up". This ammo was causing several hung cases in the chambers... and was giving light primer strikes on several of the other rifles. It was good, because those running it, were really getting their remedial action drills down pat.

    The stoppage had the BCG locked up so tight, the only way to free it was to remove the buffer tube assembly.

    That was a first for me.
    Last edited by DMack; 02-03-11 at 06:10.
    ----------------------------------------------------
    SGT Steven McGovern KIA - Iraq 21 APR 05.

    A friend, a brother, a true quiet professional. You will NEVER be forgotten.

  8. #8
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    Since the M193 was old training stock, do you think they might've stored it in too hot a location at some point? If so, that could lead to powder degradation and pressure spikes which might explain the hung cases and the popped primer.

  9. #9
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    Anyone happen to inspect this ammo before the training?

    Also as a side question; isn't SS109 was green tip?

  10. #10
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    We had a huge lot of Federal uncrimped primers create havoc. Many pallets went back.

    Most of the issues were in the FCG where 2 rifles went auto. However I have seen blown primers end up in the lug area and one rifle locked up tighter than a drum from a primer wedged in the cam pin cut out on the carrier.

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