Full-size first-generation M&P in .45 ACP with a 4.5-inch barrel. Larger frame than the 9mm M&P to accommodate the wider .45 cartridge. Was S&W's primary polymer .45 offering and competed with Glock 21 and Springfield XD-45 for duty .45 contracts. Type: Pistol Action: Semi-Automatic Caliber: 45 ACP Capacity: 10 Year introduced: 2007, USA Weight: 26.7 oz Overall length: 8.05" Status: Discontinued Intended use: Duty / Service, Law Enforcement