To build an AR platform unlike any other, WMD Guns coated every exterior surface with NiB-X, an exclusive nickel boron formulation. So you get a finish thats 40% harder than chrome, and incredibly resistant to moisture, corrosion, and wear. Key internal components are coated with NiB-X to reduce friction & wear, for an action thats incomparably smooth, utterly reliable, and as close to self-cleaning as you can get.Features :Pistol bufferOptics readyNickel boron coatedFree float railLow profile gas block