The MP5 is the most widely deployed submachine gun in history, serving with military and law enforcement units in over 40 countries. The roller-delayed blowback action delivers exceptional accuracy for a submachine gun. The standard MP5 with 8.86-inch barrel became the definitive counterterrorism tool after its use in the 1980 Iranian Embassy siege in London. Type: Submachine Gun Action: Roller-Delayed Blowback Caliber: 9mm Capacity: 30 Year introduced: 1966, Germany Weight: 5.6 oz Overall length: 26.77" Status: Active Military use: Yes Intended use: Military Use, Law Enforcement, Special Operations