This HK MP5 A5 is a fully licensed AEG airsoft rifle with official Heckler & Koch trademarks is offered by Elite Force Airsoft and Umarex USA. It has a full metal upper receiver and barrel assembly with a tough nylon polymer lower receiver and handguard. Inside is VFC's reliable Avalon gearbox and inline MOSFET. It has an MP5 collapsible stock and fires in the velocity range of 370-390 fps with .20 gram airsoft BBs and has adjustable hop-up. The threaded muzzle is the HK 3-lug design. It has both semi- and full-auto modes. Battery not included.