Noveske Dust Cover Features The Noveske Ejection Port Cover Kit is built to fit standard Mil-spec AR-15 upper receivers giving owners a complete replacement dust cover rather than a single component that still requires sourcing the rest of the hardware. The kit includes the port door itself along with the rod spring and clip needed for a full installation so the only tool typically required is a punch to drive the retaining pin. Finished in black to match standard AR-15 upper finishes the cover blends in visually while still protecting the action from dirt and debris when closed. This completeness makes the kit a straightforward bolt-on upgrade rather than a parts-hunting project. What sets this cover apart is the 300 BLK engraving on the outward facing side a small but useful detail that marks the rifle s chambering at a glance. This can help prevent confusion when a shooter owns multiple AR-pattern rifles in different calibers that otherwise look nearly identical. Beyond the cosmetic marking the cover still performs its core job of keeping the ejection port sealed when the bolt is forward protecting internal components from contamination. Available at GrabAGun this Noveske cover kit is a simple way to finish or refresh a .300 Blackout AR build. Noveske Dust Cover Specifications Manufacturer: Noveske Model: Dust Cover Type: Ejection Port Cover Kit Color: Black Compatible Hosts: AR Rifles Includes: Dust Cover Rod Spring Clip Available At: GrabAGun