Lead & Steel ARC M-16/AR-15/AR-10 Mil-Spec Complete Bolt Carrier Group Black. Mating surfaces are precision ground for a consistent gas seal to your carrier. Specifications for Lead & Steel ARC M-16/AR-15/AR-10 Mil-Spec Complete Bolt Carrier Group: Manufacturer: Lead & Steel Color: Black Fabric/Material: Carbon Steel Gun Make: AR Platform Gun Model: AR-15 Features of Lead & Steel L&S Arc M16/Ar15/Ar10 Mil Spec Machined Carrier Gas Key - Parkerized Chrome Lined Carbon Steel Internally chrome lined Mil spec Externally parkerized Package Contents: Lead & Steel L&S Arc M16/Ar15/Ar10 Mil Spec Machined Carrier Gas Key - Parkerized Chrome Lined What firearm models does the manufacturer say Lead & Steel ARC M-16/AR-15/AR-10 Mil-Spec Complete Bolt Carrier Group is compatible with? The manufacturer says that Lead & Steel ARC M-16/AR-15/AR-10 Mil-Spec Complete Bolt Carrier Group is compatible with AR-15Lead & Steel 100123: ARC M-16/AR-15/AR-10 Mil-Spec Complete Bolt Carrier Group Black