ABC RIFLE COMPANY AR-15 Engraved Ejection Port Dust Cover Assembly 5.56x45mm NATO Black. It includes a 4140 steel rod ejection port cover spring and E-clip retaining ring for secure installation. Designed for AR-15/M4 platforms it features an engraved marking for easy caliber identification. This cover adds both functionality and a custom touch to your upper assembly. Specifications for ABC RIFLE COMPANY AR-15 Engraved Ejection Port Dust Cover Assembly: Manufacturer: ABC RIFLE COMPANY Color: Black Finish: Engraved Gun Model: AR-15 Gun Make: AR Platform Gun Type: Rifle Package Contents: ABC RIFLE COMPANY AR-15 Engraved Ejection Port Dust Cover Assembly What firearm models does the manufacturer say ABC RIFLE COMPANY AR-15 Engraved Ejection Port Dust Cover Assembly is compatible with? The manufacturer suggests that ABC RIFLE COMPANY AR-15 Engraved Ejection Port Dust Cover Assembly is compatible with AR-15ABC RIFLE COMPANY EPC15-556: AR-15 Engraved Ejection Port Dust Cover Assembly 5.56x45mm NATO Black