If you are really set on a derringer, I would be thinking Bond Arms or American Derringer. They are both more money. But you really do get what you pay for. Both of the derringers I mention come in .45 colt and .410 shot shell. Just do a google search. They both have their own website.
Romans 1:16 I am not ashamed of the gospel, because it is the power of God for the salvation of everyone who believes: first for the Jew, then for the Gentile.