AR-15 M16 M4 A3 Flattop Upper Receiver Parts KitThis kit contains all 8 parts needed to complete an flattop A3 upper receiver. Includes:Forward Assist Assembly(Forward Assist, Spring & Pin)Ejection Port Cover Assembly(Port Cover, Rod, Clip & Spring)Charging Handle AssemblyUpper Receiver, Bolt, Bolt Carrier, and Barrel assembly not included.