well d4805 m16 carbine electric airsoft gun full auto hybrid gearbox fps-300 high capacity 500 round mag(Airsoft Gun) Features: Modeled After the Iconic US Army M16 Carbine Assault Rifle! True 1:1 Scale! Electric Powered (AEG) Hybrid Gearbox! (2 Metal Gears, 2 Plastic Gears) Velocity (FPS): 300 with 0.20g BB's Adjustable Hop Up System Can Switch Between Full and Semi Automatic with the Flick of a Switch! Plastic Receiver Retractable Stock High Capacity 500 Round Magazine Requires Ni-Mh 1100mAh 8.4V Battery to run (Included) Length: 31"