Brownells Ejection Port Cover Door Features The Brownells Ejection Port Cover Door is built to the standard AR-15 profile so it installs using the factory hinge rod and retaining hardware without any fitting. A properly functioning cover door snaps shut under spring tension when the bolt is forward keeping rain dust and debris out of the action during field carry or storage. Over time factory covers can loosen crack or lose their spring tension and this replacement restores that positive closure. It is a simple low-cost fix for a small part that has an outsized effect on keeping the action clean. Fitting any standard AR-15 this cover door pairs with the corresponding ejection port cover rod and C-clip to complete the assembly. Replacing a worn cover is one of the more overlooked pieces of routine AR-15 maintenance but a loose or missing cover leaves the chamber exposed to the elements during hunting range trips or storage. Keeping a spare on hand means a quick fix rather than a rifle running with an open unprotected ejection port. This part is a practical addition to any AR-15 spares kit. Brownells Ejection Port Cover Door Specifications Brand: Brownells Compatible Hosts: AR-15 Available At: GrabAGun