The Competition Series HK UMP 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. It has a version 3 gearbox and a micro switch trigger contact for quick and crisp trigger pull and response. Folding the stock to the side gives you access to the quick change spring feature. It also gives you access to the battery storage area. Comes with a 8.4V NiMH rechargeable battery & charger. This is an Officially licensed replica! Accept no imitations! Licensed Trademark of Heckler & Koch GmbH