LBE Unlimited AR15 Upper Forward Assist/Ejection Port Cover Assembly Installed Black. 56x45mm NATO Finish: Anodized Color: Black Gun Model: AR-15 Magazine Included: No Package Contents: LBE Unlimited AR15 Upper Forward Assist/Ejection Port Cover Assembly Installed What firearm models does the manufacturer say LBE Unlimited AR15 Upper Forward Assist/Ejection Port Cover Assembly Installed is compatible with? The manufacturer says that LBE Unlimited AR15 Upper Forward Assist/Ejection Port Cover Assembly Installed is compatible with AR-15LBE Unlimited LBARUPPER: AR15 Upper Forward Assist/Ejection Port Cover Assembly Installed Black