The Fortis Billet Dust Cover is manufactured from a solid piece of aircraft grade aluminum. This ensures overall durability and reliability vs other polymer versions. Easy to install and upgrade your existing ejection port dust cover on your .223/556 compatible builds. Will fit into mil-spec AR15 uppers and will quickly upgrade the form and function of your AR15. IncludesAircraft Grade Aluminum Ejection Port Dust CoverEjection Port Dust Cover SpringEjection Port Dust Cover C-Clip FeaturesMaterial: Aircraft Grade 6061-T6 AluminumWeight - 0.4 ozLength - 3.13"Width - 0.885"Type III Hardcoat Anodize