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Thread: Torn Case

  1. #1
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    Torn Case

    Was tweaking the zero on my SBR today and had what I thought was a failure to eject. After screwing around it became clear that something was preventing rounds from entering the chamber. I looked around and sure enough found the ass-end of a case and then found the front. Fortunately I had a CJ Weapons Broken Shell Extractor in my bag and finally got a chance to use it. It worked perfectly! Good thing too, because it would have shut me down otherwise.



    I am going to buy another one of these and keep it on my "serious" AR while the other one can stay in my range bag.

    (I was shooting reloaded m855 green tip, BTW...)

  2. #2
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    How did the case break like that?

  3. #3
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    Just one of those things. Must have been a piece of brass that got reloaded one too many times or was slightly out of spec. An 11.5" SBR has a relatively violent extraction but I am using an H2 buffer and I am *not* using an extractor O-ring, so it shouldn't be too brutal.

    It could also be a tight chamber, but it is a BCM so I doubt that is the reason. It's possible, though. We'll see down the road if it happens again.
    Last edited by Jay Cunningham; 03-17-10 at 16:42.

  4. #4
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    Seen often...with predictability...in certain reloads using "once fired" brass that isn't.
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  5. #5
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    Pretty nasty. Good thing you had the ruptured case extractor. Every range kit should have one.



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  6. #6
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    There is a good probability of this happening if the reloads are made from SAW (M249) brass.
    Jack Leuba
    Director, Military and Government Sales
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    jleuba@knightarmco.com

  7. #7
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    something to do with the SAW belt links making that part of the case weaker than the rest?

  8. #8
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    Quote Originally Posted by ForTehNguyen View Post
    something to do with the SAW belt links making that part of the case weaker than the rest?
    Someone here has to have the answer to that question. I know it's not the links though, I think it has something to do with the extraction process. I remember reading briefly somewhere that the brass gets stretched some how. I just don't remember how, or why.

    Anyway care to fill us in?
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  9. #9
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    Quote Originally Posted by Iraqgunz View Post
    Pretty nasty. Good thing you had the ruptured case extractor. Every range kit should have one.

    I've had this happen on a bench gun and found that sticking a tight fitting bronze brush up into the case did the trick. Luckily I had my cleaning kit with a bunch of different brushes.
    "You cannot invade the mainland United States. There would be a rifle behind each blade of grass."
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