The MP5 A3 variant features a retractable metal stock rather than the fixed stock of the A2, allowing length-of-pull adjustment for different operators and gear. Type: Rifle Action: Semi-Automatic Caliber: 9mm Capacity: 30 Year introduced: 1966, Germany Weight: 80 oz Overall length: 27" Status: Active Military use: Yes Intended use: Law Enforcement, Military, Special Operations