There are ten-round magazine versions of each pistol available for the California, Massachusetts, New York, Washington State, New Jersey, Australian, and Canadian markets. An integrated Picatinny rail can be found underneath the slide on the front of the frame for attaching tactical lights, lasers and other accessories. Both the front and rear sights are dove-tailed into the slide, and can be horizontally drifted to adjust for windage correction. The standard iron sights are of the three dot type and made of steel. The pistols are delivered with two magazines. Massachusetts approved models have a trigger pull of 45 N (10 lb f). The competition oriented M&P40 Pro Series have a reduced trigger pull of 20 N (4.5 lb f) due to the installation of a Smith & Wesson performance center sear. The M&P45c models have a slightly higher rated trigger pull of 31 N (7.0 lb f). The M&P factory trigger is of the jointed type and has a trigger travel of 7.6 mm (0.3 in) and is rated at 29 N (6.5 lb f). Because the striker is only 98% cocked prior to the trigger being pulled, Smith & Wesson classifies the M&P's action as "striker fired (double action only)". When the pistol cycles for the next shot, the striker will be automatically pre-set in a 98% cocked position. This system is similar to the partially tensioned striker found in the Glock series of pistols. This camming action moves the striker to the rear very slightly during the trigger pull, thus finishing the "cocking". According to M&P gunsmith Dan Burwell, the angle on the rear face of the sear creates a camming action against the striker. The striker makes contact with the primer of the chambered round, which in turn ignites the gunpowder and propels the bullet forward. The sear is rotated downward by the trigger bar, fully cocking, then releasing the striker. At the rearward extreme of the trigger bar's travel, it engages the sear. When the trigger of the M&P is pulled, the trigger bar first engages the firing pin safety plunger, lifting it upward, and releasing the firing pin safety. At this point, the sear is held back in a partially cocked condition. Īs the slide of the pistol enters battery, the striker engages the sear. This was done to make the rail system self cleaning, by leaving room for any dirt or small foreign objects to fall out of the weapon. The slide has four contact points with the frame. The pistol has a low slide profile which holds the barrel axis close to the shooter's hand and makes the M&P more comfortable to shoot by reducing muzzle rise and allowing faster aim recovery in rapid shooting sequence. The Melonite process produces a matte gray non-glare surface with a 68 Rockwell C surface hardness rating. The slide and barrel are made of stainless steel, that after hardening is treated with a proprietary nitriding process called Melonite. The pistol comes with four removable and interchangeable grip inserts and features a 108° grip angle. 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.
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