Forward Controls Design Billet 7075 Dust Cover is designed to keep debris out of your rifle's ejection port with a slightly easier design to close. There id one dimple on the cover to allows for tactile feedback when closing the dust cover. The cover is made from a 7075 billet aluminum with a Type III anodized coating for longevity. This ejection port cover is designed to create more space between the ejection port cover and the receiver to allow for easier closing.