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Reliability of High Standard Derringer?

Discussion in 'Gunsmithing and Repairs' started by cc-hangfire, Jul 23, 2020.

  1. cc-hangfire

    cc-hangfire Member

    Joined:
    Apr 28, 2014
    Messages:
    499
    DD11F575-F733-4BD4-A71C-5EC771BE759B.jpeg I have a High Standard Derringer, Model DM-101 Model in .22mag that does not reliably fire the upper chamber. From looking at the mechanism, it’s my opinion that the problem is in the design geometry of the internal parts. The firing pin (for want of a better term) alternates between the top and bottom chamber, and while the length is sufficient for a hard strike on the bottom, it is not quite long enough for the same strike protrusion distance on the top.

    My questions:
    1) am I correct in the above assessment?
    And
    2) is there a solution to fix the issue?

    There are much better modern pocket guns available, but I’m always tinkering on some old gun to return it to function.
     
  2. a5werkes

    a5werkes Member

    Joined:
    Apr 28, 2009
    Messages:
    195
    What does the firing pin profile look like? Quality photo would be handy to assist you.
     
  3. Catpop

    Catpop Member

    Joined:
    Dec 29, 2012
    Messages:
    2,204
    Location:
    Jack's Neck, NC
    Mine sucks! Right along with the two Taurus’ I own.
     
  4. cc-hangfire

    cc-hangfire Member

    Joined:
    Apr 28, 2014
    Messages:
    499
    EE1A8661-7162-4590-AB21-6483174EDD40.jpeg
    Ha! Confirmation received.

    I am attaching a pic showing the firing pin as seen from the bolt face. It does not protrude with the trigger pulled, & I’m not disassembling it again just yet. No chips, dings, or wear evident. Being rimfire, the firing pin face is rectangular.
     
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