Noveske (marked) AR15 5.56MM BCG with a black nitride finish. Carrier features 8620 steel with 9310 bolt and tool steel extractor and cam pin.

Much more than typical Parkerizing, phosphating, or black oxide, Blacknitriding℠ is a thermal chemical diffusion of nitrogen and carbon into the surface of the steel. This process increases wear-resistance, fatigue strength, corrosion resistance, lubricity, and cosmetic appeal.