The WMD NiB-X .308 Bolt Carrier Group delivers exceptional reliability and longevity in the harshest operating conditions with its advanced NiB-X coating and DPMS compatibility.WMD NiB-X .308 Bolt Carrier Group (without hammer)NiB-X coating for superior corrosion resistanceHeat treated for enhanced durabilityEasy cleaning and maintenanceReduced fouling adherenceDPMS compatible designEngineered for serious shooters who demand reliable performance and easy maintenance this bolt carrier group provides long-lasting service in demanding environments while simplifying cleaning procedures.