Strike Industries PolyFlex Dust Cover for .223/5.56 AR-15 Mil Spec Black One Size. 223/5.56 offers a simple quick and tool-less installation with its one-piece construction. Install in literally seconds by just pushing it into place. With their patent pending "True Seal" design the internal lip seals the port tighter than traditional dust covers. Unlike stamped steel dust covers this PolyFelx DC is made of durable and lightweight polymer which makes it resistant to rust. If the time ever comes knowing you can remove and quickly reinstall makes this an easy cost-effective choice. Consider the Strike Industries PolyFlex Dust Cover for .223/5.56 for a new build or when you are going to untorque the barrel nut as this is the easiest time to remove your old stamped steel dust cover to upgrade. Specifications for Strike Industries PolyFlex Dust Cover: Manufacturer: Strike Industries Color: Black Gun Model: AR-15 Fabric/Material: Polymer Features of Strike Industries PolyFlex Dust Cover Quick and toolless installation Onepiece construction Patent pending "True Seal" internal lip seals the port tighter than traditional dust cover designs Resistant to rust unlike traditional steel covers Made of durable and lightweight polymer Package Contents: Strike Industries PolyFlex Dust Cover x1 Polyflex Dust Cover for .223/5.56 What firearm models does the manufacturer say Strike Industries PolyFlex Dust Cover is compatible with? The manufacturer suggests that Strike Industries PolyFlex Dust Cover is compatible with AR-15Strike Industries SI-POLYFLEX-DC-223: PolyFlex Dust Cover for .223/5.56 AR-15 Mil Spec Black One Size