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Cobra is the High Point of derringers. Cool little gun, but you can buy one new for like $100 in a free state. Double that in MA.
Be careful when you load it as the firing pin can hit t he primer when you close it. Put the gun on half cock before you load it to prevent this
I just secured my Dad's firearms while he's dealing with a health issue. One of them is a Derringer from Cobra Enterprises in .22 Mag, long bore. I have no knowledge or experience with these, tell me about it ...