The Heckler and Koch MP5 is the most widely used submachine gun in the world, renowned for its accuracy, reliability, and closed-bolt firing system. Based on the G3 roller-delayed blowback system scaled down to 9mm, it was adopted by GSG-9, the SAS, and police tactical teams worldwide after the 1977 Mogadishu hostage rescue demonstrated its effectiveness. Type: Submachine Gun Action: Semi-Automatic/Full-Auto Caliber: 9mm Parabellum Capacity: 30 Year introduced: 1966, Germany Weight: 5.6 oz Overall length: 26.8" Status: Active Intended use: Military, Law Enforcement, Special Operations