I made my thoughts known in the recent Derringer thread , but yup, AD's are a cliche with them also .
Traditional Remington copies don't have transfer bar . Some more recent ones have a safety . But even if functional in the sense of not going bang , they are cumbersome on top of already cumbersome getting into action, that many would skip using them.
In Sixguns , Keith related an incident that occurred shortly before he finished the writing . One of the Reserve Deputies in his area carried a ( probably Great Wetern ) .38spl Derringer . They were required to carry at least a .38spl , and a Derringer was least expensive/ least obtrusive for a non-gun person ( aka NDP ) . At the office the Derringer fell out of his pocket, and he reached to try to grab it . From the balance, it hit butt first, struck hammer, discharged , and fatality hit him in the chest .
If you just have to carry a Derringer, the High Standard hammerless design is reasonably drop safe .
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I don't know who originally coined the term , but Jeff Cooper occasionally referred to Non Dedicated Personnel . Not only referring to the totally incompetent , but also persons armed for their occupation or circumstance that met the relevant minimum training standards , but no further knowledge , or practice, or pursuit of further skills .
One of his observations that would probably be well recieved here was to the effect that the best handgun for Non Dedicated Personnel would be a .44Spl revolver .