Smith &amp; Wesson M&amp;P (Military and Police) is a series of handguns named after the famous 20th century Smith &amp; Wesson service revolvers. They are designed mainly for military, police and personal defense use. They are offered in calibers including: .22 LR, .380 ACP, 9×19mm Parabellum, .357 Magnum and .45 ACP.