Luth-AR Bolt Carrier Group Features The Luth-AR Bolt Carrier Group is coated in Nickel Boron a finish valued for its hardness and low friction surface that reduces wear between the bolt carrier and the inside of the upper receiver. That same Nickel Boron coating resists corrosion far better than a standard phosphate finish which matters for a part that sees constant heat and carbon fouling during firing. The silver colored finish also makes it easier to spot carbon buildup during cleaning since fouling shows clearly against the bright surface. Because the carrier is fully assembled it arrives ready to install without the owner needing to source or fit individual components. This bolt carrier group includes the bolt and carrier key firing pin firing pin retaining pin cam pin and the key screws that hold it all together giving a complete drop in replacement for AR-15 pattern rifles in .223 Remington and 5.56 NATO. Built from top grade materials the assembly is designed for reliable cycling across repeated range sessions and higher round count use. The low friction Nickel Boron surface can also make field cleaning faster since fouling tends to wipe away more easily than it does from a traditional finish. The Luth-AR Bolt Carrier Group is for sale at GrabAGun for AR-15 owners looking to upgrade reliability and ease of maintenance in one part. Luth-AR Bolt Carrier Group Specifications Manufacturer: Luth-AR Model: Bolt Carrier Group Compatible Hosts: AR-15 Caliber: .223 Rem / 5.56 Finish: Nickel Boron Color: Silver Available At: GrabAGun