TAPCO AR-15 Upper Parts Kit - The TAPCO AR-15 Upper Parts Kit is made from quality steel. The pieces in the TAPCO Upper Parts Kit are highly wear-resistant and are able to withstand the wear and tear of continuous shooting. Many of the parts feature a black phosphate finish that provides corrosion protection from extended shooting. Contains: Forward Assist (1) Forward Assist Spring (1) Forward Assist Roll Pin (1) Ejection Port Door (1) Ejection Port Door Spring (1) Ejection Port Door Pin (1) C-Clip (1)