Dark Storm Industries DS-15 Upper Parts Ejection Port Door/Pin/Spring/C-Clip Forward Assist/Spring/Pin. Specifications for Dark Storm Industries DS-15 Upper Parts Kit: Manufacturer: Dark Storm Industries Color: Black Finish: Anodized Additional Features: AR15 Last Chance: Yes Features of Dark Storm Industries DS-15 Upper Parts Kit Includes: Ejection Port Door Ejection Port Door Pin Ejection Port Spring Ejection Port C-clip Forward Assist - True Mil-Spec Pinned NOT Glued Forward Assist Spring Forward Assit Roll Pin Package Contents: Dark Storm Industries DS-15 Upper Parts Kit Dark Storm Industries DSI-UPR-PK5: DS-15 Upper Parts Ejection Port Door/Pin/Spring/C-Clip Forward Assist/Spring/Pin