The UMP (Universale Maschinenpistole) was designed as a lower-cost alternative to the MP5, featuring a polymer receiver and short-stroke gas piston operation instead of the roller-delayed system. The .45 ACP variant was adopted by US Customs and Border Protection and several SWAT teams. The 25-round magazine is standard. Type: Submachine Gun Action: Short-Stroke Gas Piston Caliber: .45 ACP Capacity: 25 Year introduced: 1999, Germany Weight: 5.6 oz Overall length: 27.17" Status: Active Intended use: Law Enforcement, Special Operations