Je Machine Tech Dust Cover Features The Je Machine Tech Dust Cover is engineered specifically to reduce weight and simplify installation compared to a traditional stamped steel ejection port cover. Molded from black polymer it resists corrosion entirely since there is no bare metal to rust which matters for a part that is directly exposed to the elements during use. The lightweight design shaves reciprocating mass off the upper receiver assembly a detail that shooters chasing every ounce of weight savings on a build will appreciate. It is built to fit standard AR-15 upper receivers without modification making it a drop in replacement for a factory or worn out cover. Keeping the action covered when the rifle is not in use helps keep sand dust rain and other debris out of the bolt carrier group and chamber area which supports more reliable cycling over the life of the rifle. The polymer construction also means the cover will not show the wear marks or scuffing that a painted or coated steel cover eventually develops. Builders assembling a lightweight competition or range rifle will find this an easy place to trim ounces without giving up functionality. This Je Machine Tech Dust Cover is available for sale at GrabAGun for anyone upgrading or replacing the ejection port cover on a standard AR-15 upper. JE Machine Tech Dust Cover Specifications Manufacturer: JE Machine Tech Color: Black Material: Polymer Compatible Hosts: Standard AR-15 Upper Receivers Available At: GrabAGun