They call it a derringer, and that's what it is. Ever since Henry Deringer created the first muzzle-loading pocket pistol the misspelled "derringer" has been a generic name for a single-or-two-shot personal weapon, small enough to be carried in a jacket or pants pocket and only for last-ditch use. They have always been popular and likely always will be.
Dismiss it all you like. If you need one it's better to have it than not.
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“Never do anything you can't take back.”
—Rocky Russo
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