The UMP 40 is the .40 S&W variant of the UMP submachine gun series, chambered in the cartridge that was standard for many American law enforcement agencies in the 2000s. It uses a heavier bolt compared to the .45 variant and accepts 30-round magazines. Less widely adopted than the .45 as agencies moved away from .40 S&W. Type: Submachine Gun Action: Short-Stroke Gas Piston Caliber: .40 S&W Capacity: 30 Year introduced: 2000, Germany Weight: 5.3 oz Overall length: 27.17" Status: Discontinued Intended use: Law Enforcement