Soft Air Colt M4A1 RIS Airsoft Gun by King Arm's, Black Recommend King Arms .20g BB's or heavier for optimum performance. Includes Battery and Charger Ultra Grade all metal gears and gearbox with Nylon Fiber receiver 350-380 FPS using .20g BBs Rail Integrated System-RIS Spin Up Adjustable Accuracy System This product is restricted from shipment into the state of New York