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Nickel Boron Bolt Carrier Groups are becoming the rage among AR-15 builders and shooters all over the country and it's easy to see why. They look great and perform even better due to the silky smooth feel and finish of the material. If you are looking to upgrade the internals of your AR-15 or wanting to build a one of the smoothest cycling rifles that can be had, then look no further. The Anderson Nickel Boron BCG is your answer. <br>Nickel Boron M16 BCG made from 8620 steel, Bolt is made from 9310 steel. The 223 Bolt and Bolt Carrier Assembly comes complete with cam pin, firing pin and firing pin retainer. A high quality, smooth and very affordable drop in bolt carrier group for all .223 / 5.56 or .300 Black Out rifles. These BCG's are used successfully in commercial and military builds around the world.<br>The Nicklel Boronmaterial used in this Bolt Carrier Group helps the rifle cycle smoothly even is situations with low lube. The Nickel Boron coating makes for quick and easy cleaning of the bolt carrier. This is because the coating is so slick that the carbon left behind after shooting has a hard time sticking to it