This high end AEG made by King Arms is fully licensed and trademarked through Oberland Arms. This gun is designed for CQB combat. The gun has a full sized CNC machined RIS with a top rail that spans the entire top of the AEG. Included with the gun are high quality front and rear flip up sights. The sights can easily be flipped down or removed to make room for any optics you may choose to add this this airsoft gun. For added realism, this gun has a functional bolt catch/release system that makes the hop-up easily accessible. The battery is stored in the stock and can house a 9.4v 1600 mAh nunchuck battery, or a butterfly style LiPO. This gun is LiPO ready out of the box. Magazine capacity is 300 rounds. The gun is compatible with standard M4 high cap, mid cap, and low cap magazines. Battery and charger sold separately.