Smith & Wesson M&P40, 40SW- Pro Series 5" Barrel Black Stainless Melonite 15+1 Round In the design of the M&P, Smith & Wesson considered the needs of military and law enforcement from every conceivable angle. No other polymer pistol offers this combination of versatility, durability and safety. The M&P extra features include unparalled ergonomic design, stainless steel structural components, internal lock system on select models to prevent unauthorized use and a universal picatinny rail for laser and light mounting.