Diamondback Firearms SDR, Self Defense Revolver, Double Action/Single Action, 357 Magnum/38 Special, 2 Barrel, Steel, Polished Finish, Stainless Steel, Black Rubber Grip, Fiber Optic Sights, 6 Rounds DB0700S701 Diamondback Firearms offers high-quality firearms that are vetted by the everyday shooter, battle-tested operators, and entrusted police officers at a price point that meets the American blue-collar workers budget. Diamondback firearms started with the tried-and-true, U.S. Military-proven gas-impingement system and use only the highest quality components machined in Diamondback's CNC facility.