If you want an extremely realistic, fully licensed M4A1 then this is the gun for you. This AEG features full metal construction and fully licensed Colt trademarks. This gun is extremely durable and can easily handle the stress of any airsoft battle. Internally this gun is top notch, featuring a full metal gearbox and steel gears. An 8.4v battery and charger are included as well as a small pack of BBs. OEM by CYMA.