Magpul Industries Enhanced Ejection Port Cover, Polymer Construction, Matte Finish, Black MAG1206-BLK The Enhanced Ejection Port Cover is a drop-in upgrade designed to provide an improved installation process" physical strength" and corrosion resistance over the standard USGI ejection port cover. Traditional stamped steel ejection ports are malleable" prone to corrosion" and require tools to install. The Enhanced Ejection Port Cover snaps into place easily without having to remove your handguard or barrel nuts" wind any loose springs" or adjust small e-clips. Constructed of impact-resistant injection molded polymer" it is corrosion-resistant and will not bend or deform from impacts.