CMC Triggers Ejection Port Cover Assembly Features The CMC Triggers Ejection Port Cover Assembly is built to fit standard AR-15 upper receivers replacing the factory dust cover with a complete assembly ready to install. Keeping the ejection port covered when the bolt is forward helps keep dust dirt and moisture out of the action which matters for both reliability and long-term wear on internal components. The black finish matches the standard appearance of most AR-15 uppers so the part blends in rather than standing out. Because it is sold as a complete assembly builders do not need to source the cover spring and pin separately. This cover assembly is a straightforward fix for an AR-15 that is missing its dust cover entirely or running one that has become damaged or worn past reliable function. A functioning ejection port cover is a small detail that is easy to overlook but it plays a real role in keeping an action clean between range trips. Installing this assembly takes only basic tools and a few minutes of work making it accessible to builders at any experience level. Available at GrabAGun this CMC Triggers cover assembly is an affordable way to keep an AR-15 upper properly protected. CMC Triggers Ejection Port Cover Assembly Specifications Manufacturer: CMC Triggers Model: Ejection Port Cover Assembly Type: Dust Cover Color: Black Compatible Hosts: AR-15 Available At: GrabAGun