The UMP (Universal Machine Pistol) .45 was designed as a lower-cost successor to the MP5, using polymer construction and a straight blowback system in .45 ACP. Type: Rifle Action: Semi-Automatic Caliber: .45 ACP Capacity: 25 Year introduced: 1999, Germany Weight: 82 oz Overall length: 27.5" Status: Active Intended use: Law Enforcement, Special Operations