The Fortis Standard Billet Dust Cover is a solid billet upper receiver upgrade that will look sleek on any upper receiver. These AR15 Lower Parts by Fortis Manufacturing are easy to install and upgrade your existing ejection port dust cover on any MIL-SPEC AR15 upper, and will quickly upgrade the form and function of your favorite rifle. Fortis Manufacturing Ejection Port Covers are built with an incredibly durable aircraft grade aluminum, and are resistant to corrosion and wear and tear. Install a Fortis Standard Billet Dust Cover on your existing ejection port dust cover to improve the aesthetics of your current build. Specifications for Fortis Manufacturing Standard Billet Dust Cover: Manufacturer: Fortis Manufacturing Finish: Type III Hardcoat Anodized Gun Model: AR-15 Fabric/Material: Aircraft Grade 6061-T6 Aluminum Condition: New Caliber: 5.56x45mm NATO, .223 Remington Package Contents: Fortis Manufacturing Standard Billet Dust Cover Aircraft Grade Aluminum Ejection Port Dust Cover Ejection Port Dust Cover Spring Ejection Port Dust Cover C-Clip