CMC Triggers AR-15 Upper Receiver Parts Kit Black Small. This kit has the small pieces you'd otherwise have to source one at a time. You get the ejection port cover the cover rod with its clip and the cover spring plus the forward assist its spring and the roll pin. Everything is 4140 chrome moly steel so it holds up to the pounding those parts take. Buying it as a kit means fewer line items on your order and nothing missing when you sit down to build. Specifications for CMC Triggers AR-15 Upper Receiver Parts Kit: Manufacturer: CMC Triggers Color: Black Gun Make: AR Platform Gun Model: AR-15 Handle Color: Black Package Contents: CMC Triggers Upper Receiver Parts Kit Fits AR-15 Black What firearm models does the manufacturer say CMC Triggers AR-15 Upper Receiver Parts Kit is compatible with? The manufacturer suggests that CMC Triggers AR-15 Upper Receiver Parts Kit is compatible with AR-15CMC Triggers CMC-AR15-UPK: AR-15 Upper Receiver Parts Kit Black Small