The UMP45 is the .45 ACP variant of the UMP, the largest-caliber offering in the line. It was adopted by US Customs and Border Protection as its standard submachine gun. The .45 ACP version uses a 25-round magazine and shares the polymer construction and folding stock of other UMP variants. Type: Submachine Gun Action: Semi/Full-Auto Caliber: .45 ACP Capacity: 25 Year introduced: 1999, Germany Weight: 80 oz Overall length: 17.7" Status: Active Intended use: law_enforcement, military