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Jacob Grey Firearms Ultralight 5.56 Nato High Polished PVD Bolt Carrier Group (BCG)s has been discontinued by Jacob Grey Firearms and is no longer available. Our product experts have helped us select these available replacements below.You can also explore other items in the Gun Parts, AR 15 Parts, Rifle Parts, AR15 Upper Parts, Bolt Carrier Groups yourself to try and find the perfect replacement for you!
Jacob Grey Firearms DLC (Diamond-Like Carbon) coatings have been widely successful in the aerospace industry. Jacob Greys carbon-based coating has extreme hardness due to the diamond crystal structure and is soft and lubricious due to the graphite crystal structure. Our DLC coatings are generally amorphous (without typical crystal structure). The properties of DLC coatings in terms of increased hardness, coefficient of friction, roughness, adhesion level, load carrying capacity, resistance to humidity influenced degradation, fatigue tolerance, etc. can easily be explained as beneficial within the firearms industry. But with its sleek and stylish looks and its ability to withstand carbon buildup and fouling, why would you want anything less inside your firearm. Available in Jacob Greys signature DLC black color Lethal Black.![]()
Why DLC on your BCG:
First off, the surface is very hard and smooth making it an extremely high wear resistance coating. The friction coefficient is greatly reduced requiring less lubrication. Operating temperatures are lowered. Yes, you can run without lubrication when its necessary but its good practice to use a small amount of oil whenever allowable.



