Smith & Wesson's Performance Center revolver combines old-world hand craftsmanship with modern technology to create extremely accurate, high performance models designed for the most demanding shooters. The M&P R8 Model features a PC trigger and trigger Stop, PC tuned action, Scandium alloy frame with a stainless steel cylinder. It has an integral accessory Picatinny style rail and an interchangeable front sight with an adjustable rear v-notch sight.