Completing the line between main production and the Performance Center" the Smith & Wesson Pro Series represents the next step from standard models. These firearms are offered with a variety of enhancements yet still remain true to stock. Bringing competition specifications and features to factory models" the Pro Series offer that ready-to-go package while still maintaining production line integrity. The Model 686 SSR features Custom Barrel with Recessed Precision Crown" Bossed Mainspring and Chamfered Charge Holes.