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.Includes: Aircraft Grade Aluminum Ejection Port Dust Cover Ejection Port Dust Cover Spring Ejection Port Dust Cover C-Clip Ejection Port Dust Cover Installation RodFeatures: Material: Aircraft Grade 6061-T6 Aluminum Weight - 0.4 oz Length - 3.13" Width - 0.885" Type III Hardcoat Anodize Made in the USA!**We've tested this on a wide array of upper receivers, however; due to the large extent of variations in the mil-spec industry, we can't guarantee this will fit on all applications.