The Smith and Wesson M&P .45ACP 4" barrel is one of a long line of duty ready pistols from one of America's oldest gun makers, built to withstand anything the world can throw at it. Designed for superior ergonomics, the high strength polymer frame with steel reinforced chassis comes standard with 3 interchangable backstraps to adjust the grip to the shooters hand. The stainless steel slide and steel barrel are coated with melonite for extra corrosion resistance. The crisp striker trigger allows consistent trigger pull for accuracy on target. The Smith and Wesson M&P .45ACP 4" is available with or without manual thumb safety for those departments or individuals who prefer a lever style safety. The Smith and Wesson M&P .45ACP comes standard with internal safety features, like a drop safety, as well as firing pin block safety. The Steel body double stack mags of the S&W M&P .45ACP 4" hold a full compliment of ammo for a long service life.