well d3807 m4 electric airsoft gun full & semi auto fps-280 ris cqb(Airsoft Gun) Features: Electric Powered (AEG) Velocity (FPS): 280 Adjustable Hop Up System Integrated RIS for Accessories Can Switch Between Full and Semi Automatic with the Flick of a Switch! Working Safety Full Fixed Stock High Capacity 250 Round Magazine Requires 7.2V 400mAh Battery to run (Included)