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Thread: Critical Failure - Seeking Advice

  1. #81
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    What about casting the chamber with Cerrosafe? That would show you exactly what is going on with the leade and throat

    http://www.midwayusa.com/product/462...g-alloy-1-2-lb

  2. #82
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    Yesterday morning I dropped an order in to Michiguns for one of the 223/5.56 chamber gages.

    I will check it when it arrives ( assume next week ) and report back.

    I did confirm with Ned directly that if it is indeed a .223 throat, his (or any for that matter) reamer would not cut the melonite barrel.

    So, I will check the chamber with the gage when it arrived, if chamber is good then it's confirmed ammo issue, if chamber is .223 it could still have been an overpressure round, but culprit may lie most firmly with the barrel and chamber throat, and I will be in that case contacting AIM/Mossberg for a resolution on the barrel.

    I did receive contact from Prvi Partizan, they asked me to send the blown case to their USA office for analysis and review.
    Last edited by awpk03s; 07-23-13 at 10:04.

  3. #83
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    Quote Originally Posted by garand1945 View Post
    What about casting the chamber with Cerrosafe? That would show you exactly what is going on with the leade and throat

    http://www.midwayusa.com/product/462...g-alloy-1-2-lb
    Honestly, it wouldn't tell him anything. Unless you have a serious set of measuring tools, Cerrosafe nothing more than a $50 per pound waste of money.

  4. #84
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    Update:

    As a brief update on this situation:

    I am still waiting on delivery of the Michiguns .223/5.56 chamber gage.

    With that said, I have decided that regardless of the results of that reading, I am going to replace the barrel in this carbine. If it's .223 Throat Leade - I will contact AIM/Mossberg for a refund/resolution. If it's 5.56mm throat leade, than I may opt to keep it as a spare.

    I have since ordered a replacement barrel - BCM 16" RECCE 410 SS IonBond mid-weight barrel and mid length gas.

    http://www.bravocompanyusa.com/BCM-1...%20ib%20bk.htm

    I am convinced this barrel will suit my need appropriately for a LONG time to come.

    Privi Partizan has also contacted me after receiving the blown out case, they informed me that it appears a longer than usual portion of the case was unsupported. They are also interested in my chamber reading results (which I informed them of was in process as an open variable). If no other explanation remains, they have offered to refund my purchase price for the ammo. I have countered that with to request an even round count exchange of new ammo, given the fact that my purchase price a year ago, won't buy me the same amount of ammo today (if I can even find it).

    I will update again with further results when the chamber gage arrives, and provide in put on the BCM barrel when I receive it also, as well as the continued correspondence with PPU-USA.

  5. #85
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    Critical Failure - Seeking Advice

    I am patiently awaiting the end results of this.

  6. #86
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    Quote Originally Posted by Jwalk74 View Post
    I am patiently awaiting the end results of this.
    At this point, I have sent photos of other fired cases to PPU without a response yet. I have not yet received the chamber gage. I hope it should arrive tomorrow or Saturday. This will verify or vilify the Mossberg barrel.

    I did receive the BCM barrel noted above, and have installed it in my rifle tonight. It passes headspace checks GO and NO-GO successfully.

    The BCM barrel is a VERY fine piece. Machining is beautiful, and the IonBond is done right. It is a little heavier barrel, but I almost think it balances a little better. This time I mounted a BCM Comp Mod 1.0 on the barrel as well.



    I will update again when I receive the Michiguns gage and can complete the cycle on the Mossberg barrel, and the final outcome with PPU.

  7. #87
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    UPDATE:

    Today I received the chamber gage from Michiguns. After work I immediately went down and pulled all of my barrels to check them with it.

    Drop the gage in the chamber. Turn barrel upside down, and see if gage drops freely. If it drops freely from the chamber, or can be removed from the chamber with no resistance, or spins freely - 5.56mm NATO chamber. If it does not drop free, does not spin freely, does not remove without resistance - less than 5.56mm NATO chamber, and possibly .223 REM or somewhere in between.

    BCM 16" RECCE SS410 Barrel:
    http://www.bravocompanyusa.com/BCM-1...%20ib%20bk.htm

    The barrel gaged correctly as 5.56mm NATO. Gage dropped freely, spun freely, had no resistance.

    Spikes Tactical M4LE Barrel:
    http://www.spikestactical.com/new/z/...fsp-p-657.html

    The barrel gaged correctly as 5.56mm NATO. Gage dropped freely, spun freely, had no resistance.

    Mossberg OEM 1x7 5.56 NATO Melonite Barrel:
    http://www.aimsurplus.com/product.as...el&groupid=573

    This barrel did not gage correctly as 5.56mm NATO. Gage did not drop freely. Did not spin freely. Removal encountered resistance.

    Pics of gage:



    Pics of gage in barrel chamber:


    Barrel marked as 5.56NATO:


    Gage does not drop freely from barrel:


    Summary:
    I'm glad I have re-barreled this carbine with the afore mentioned BCM barrel. I am excited to test it for accuracy and function soon. Regarding the Mossberg barrel - I will contact AIM tomorrow. With this in mind, I believe the overpressure situation that occurred here can be attributed to 5.56mm NATO ammunition in a .223REM chamber throat. It is confirmed the barrel is incorrectly chambered. It is and may never be proven that the PPU ammo was out of proper specification. I will also send them this information, and await their reply to confirm this line of thinking.

    Lessons Learned:
    - Always wear eye and ear protection when shooting.
    - When assembling AR uppers, always check headspace.
    - When assembling AR uppers, always check to verify the chamber is correct as advertised.
    - Do NOT fire 5.56mm NATO ammunition in a rifle with a .223 chamber.
    - Sometimes if a deal on a barrel or component seems too good to be true, it often times is.

    Perhaps some of the content of this thread could be added to a 'Sticky' to document the effects of shooting 5.56mm NATO ammunition in a .223REM chamber throated barrel. For me, I was lucky that only damage to my rifle occurred (bent extractor). As a LH shooter, this could have ended up much more negatively for me given my face's proximity to the open dustcover and BCG.
    Last edited by awpk03s; 08-05-13 at 18:48.

  8. #88
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    Re: Critical Failure - Seeking Advice

    I'm glad you got to the bottom of the issue. I recently picked up one of Ned's guages as well and it works exactly as described. It's a good piece of kit.

  9. #89
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    Not surprised by this at all. One day people will learn that there is no such thing as a cheap barrel, unless it fell off a truck.

    Maybe one day people will realize that the barrel is the starting block of the build and determines just about everything else that will happen with the build..... one day.......



    Owner/Instructor at Semper Paratus Arms

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  10. #90
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    At the end of the day, if the barrel had lived up to its' advertised specifications, it would have been a very good pickup, and I would in no way have regretted it.

    Sadly, it wasn't. It wouldn't have cost them any more machine time to make the chamber right.

    I solely regret not following the 'trust but verify' mantra with this barrel.

    On top of that it's just downright wrong that they stamp the barrel as such and sell it when it's known to not be true 5.56mm.

    I hope that everybody that ordered one of these from the variety of wholesalers and distributors that sold them gets contacted with a warning. Probably not going to happen though, and my issue of a blowout is likely not the last we will see with various manufacturers short chambering barrels closer to .223REM and advertising as 5.56mm NATO. Which is sad.

    I feel inherently good about the BCM barrel I have currently mounted. My lessons have been learned in fold, and I hope that by virtue of the world wide web, somebody else might have learned something too.

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