Taurus Millennium Pro series pistols are manufactured with injection molded polymer frames, and blued carbon steel, stainless steel, or titanium slides. The Millennium Pro pistols offer many improvements over the previous 'Standard' Millennium models, but were introduced as enhancements to the originals. Pro versions have now been released for nearly all of the 'Standard' Millennium models. Some features of the Pro line include optional increased magazine capacities, larger and easier to operate controls, a double action (DA/SA) trigger mechanism on some models with reduced trigger travel and an improved smoother and lighter trigger pull, an enhanced frame, and an improved more ergonomic grip design.