4 Troy Oz MK BarZ "Double Barrel Derringer" Sand Cast. By MK BARZ AND BULLION. Great piece of history to hold and own. Great detail on the butt and scroll work on the frame. Our your own little gun now available. This item is in the category "Coins & Paper Money\Bullion\Silver\Bars & Rounds". The seller is "maegan20050" and is located in this country: US. This item can be shipped to North, South, or Latin America, all countries in Europe, all countries in continental Asia, Australia.