AT3 Tactical AR-15 Ejection Port Cover C-Clip 2pcs. These parts are guaranteed to fit and function in your AR and are perfect for replacing lost or damaged parts. Specifications for AT3 Tactical AR-15 Ejection Port Cover C-Clip: Manufacturer: AT3 Tactical Gun Model: AR-15 Features of AT3 Tactical AR-15 Ejection Port Cover C-Clip Hinge Pin C-Clip Dust cover Rod C-Clip Package Contents: AT3 Tactical AR-15 Ejection Port Cover C-Clip What firearm models does the manufacturer say AT3 Tactical AR-15 Ejection Port Cover C-Clip is compatible with? The manufacturer says that AT3 Tactical AR-15 Ejection Port Cover C-Clip is compatible with AR-15AT3 Tactical EP-C-CLIP-2PCS: AR-15 Ejection Port Cover C-Clip 2pcs