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Thread: Diagnosing the cause of mangled cases

  1. #1
    Join Date
    Dec 2019
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    Diagnosing the cause of mangled cases

    Recently a fellow took his Dan Wesson Pointman PM2 to the range to have some fun. What he got instead was mangled brass and constant jamming. He posted a couple of pictures showing the cases.

    I looked at the pics and immediately diagnosed an extractor that was losing control of the empty cases during recoil causing them to not eject. The empty cases would then sit on top of the next round in the magazine as it was being fed. The empty cases would then get slammed into the barrel hood. I've personally experienced this specific malfunction in the past so was confident in my diagnosis.







    Eventually the fellow set about removing the extractor from the slide and discovered the firing pin stop had suffered a catastrophic failure. While my initial diagnosis was technically correct, it wasn't due to a bad extractor as you can see in the picture below. The broken firing pin stop allowed the extractor to clock which caused it lose control of the case.

    I don't think I've ever seen a firing pin stop fail like this one.



  2. #2
    Join Date
    May 2008
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    Something to inspect on a regular basis. I've caught ones on the way out with cracks in them.

  3. #3
    Join Date
    Feb 2016
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    A reason to detail strip periodically.
    A true "Gun Guy" (or gal) should have familiarity and a modicum of proficiency with most all firearms platforms.

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