well d2802 m4 ris electric airsoft gun full auto rechargeable fps-250 upgraded version, comes w/ scope(Airsoft Gun) Features: Manufactured by WELL True 1:1 Scale Electric Powered (AEG) Fully Automatic Velocity (FPS): 250 with 0.12g BB's Plastic Gear Box Retractable LE Type Rear Stock R.I.S. (Rail Interface System) Mock Scope Requires 7.2V Battery to run (Included) Length: 31.5"