The HK UMP Comp AEG Airsoft Rifle offers a full metal gearbox and gears with a reinforced ABS body. The High capacity 400 round magazine allows for lots of firing between reloads. The UMP gives you the ability to fold the stock, adjust the rear sight, and easily switch between full and semi-automatic. This is an Officially licensed replica! Accept no imitations! Licensed Trademark of Heckler & Koch GmbH.