The Heckler & Koch MP5K AEG rifle is a full metal, heavy high-quality airsoft gun. This HK MP5K features a full metal gearbox. The hop-up is fully adjustable with a side lever switch near the front handguard. The battery goes in the top upper receiver (stick type only). NOTE: This airsoft gun will only work with Elite Force MP5 Magazines. One (1) hicap 200-round magazine is included in its box. Does not include PDW stock or scope mount. Battery and charger are not included.