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FailZero manufactures the EXO Nickel Boron bolt carrier group for the M16 but is also the preferred BCG for the M4 and AR15. The Nickel Boron BCGs from FailZero and WMD both have protective coating, but FailZero makes an EXO NiB BCG that requires no lubrication. Nickel Boron treated parts include: Bolt & Extractor (5.56/.223 compatible) Bolt Carrier Extractor Cam Pin Carrier Key Firing Pin from Right To Bear Arms And Supply (Product FZ-01428)

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