The pistol frame is made out of Zytel polymer reinforced with a stainless steel chassis. An internal lock and/or magazine disconnect are available as options and an optional external thumb safety became available in 2009. This trigger system prevents the firearm from discharging unless the trigger is fully depressed, even if the pistol is dropped. The M&P is a striker-fired semi-automatic pistol. The improved trigger weight and feel and the unique takedown method (not requiring a dry-fire pull of the trigger) were meant to set the M&P apart from the popular Glock pistols. Many of the ergonomic study elements that had been incorporated into the Sigma and the Smith & Wesson SW99 were brought over to the M&P. An industry standard Picatinny rail and a higher grip has been afforded with an improved grip and beavertail. The M&P design has an improved trigger and enhanced ergonomics that allow for end-user customization.

The M&P is a hybrid evolution of the Smith & Wesson Sigma and Smith & Wesson SW99 design but does not share parts compatibility with the Sigma. While targeted at law enforcement agencies, the M&P is also widely available on the commercial market. The Smith & Wesson M&P (Military and Police) is a polymer- framed, short recoil operated, locked breech semi-automatic pistol introduced in the summer of 2005 by the American company Smith & Wesson. A Smith & Wesson M&P40 with a detached magazine.

Laser sight for a walther p22 pistol