The M&P (Military and Police) Standard .357 Sig is a variant of the M&P Standard 9mm. See http://www.gunslot.com/guns/smith-wesson-m-p-standard-9mm for full details on the firearm.
Meet the M&P From Smith & Wesson.
Reinforced polymer chassis, superior ergonomics, ambidextrous controls, proven safety features. The new standard in reliability when your job is to serve and protect and your life is on the line.
Available in .40S&W, 9mm and 357Sig.
In the design of the M&P, we considered the needs of military and law enforcement from every conceivable angle. No other polymer pistol offers this combination of versatility, durability and safety. ALL BACKED BY OUR SMITH & WESSON LIFETIME SERVICE POLICY.