Tiger Rock AR-15 Ejection Port Dust Cover Complete Assembly Black Regular. The ejection port door (dust cover) includes a steel spring a steel rod and a C-clamp everything you need to properly install a standard dust cover so you can install it yourself and not have to pay someone to do it for you. The gas tube nut is also included with this door making this a complete assembly ready to install yourself or with the help of a buddy making it a breeze Specifications for Tiger Rock AR-15 Ejection Port Dust Cover Complete Assembly: Manufacturer: Tiger Rock Finish: Matte Gun Model: AR-15 Fabric/Material: Steel Features of Tiger Rock AR-15 Ejection Port Dust Cover Complete Assembly Ejection Port Cover Door (Dust cover) Steel Spring Steel Rod C-Clamp Package Contents: Tiger Rock AR-15 Ejection Port Dust Cover Complete Assembly What firearm models does the manufacturer say Tiger Rock AR-15 Ejection Port Dust Cover Complete Assembly is compatible with? The manufacturer suggests that Tiger Rock AR-15 Ejection Port Dust Cover Complete Assembly is compatible with AR-15Tiger Rock DC223: AR-15 Ejection Port Dust Cover Complete Assembly Black Regular