Smith & Wesson J-Frame revolver is designed to fire a full power round and is as simple and easy to use as it is reliable. The Model 340 PD is a variation of the M40 Centennial AirLite which integrates the time-tested features of the original with modern advancements. This model has an matte black scandium alloy frame, Titanium alloy cylinder, black stainless steel barrel, Hi-Viz fiber optic green front and fixed u-notch rear, and an external hammer.