well d2810 m4 s-system electric airsoft gun full & semi auto fps-280 ris vertical foregrip, retractable stock(Airsoft Gun) Features: True 1:1 Scale, Looks and Feels like the US Army's M4 Rifle Electric Powered (AEG) Velocity (FPS): 280 Fully or Semi Automatic Top and Bottom RIS for Accessories Working Safety Retractable Stock ABS Body Battery Contact Magazine (Upgraded Version) Requires 7.2V 400mAh Battery to run (Included)