FailZero 450 Bushmaster Bolt Carrier Group Features The FailZero 450 Bushmaster Bolt Carrier Group arrives fully assembled and ready to drop directly into most mil-spec .450 Bushmaster upper receivers eliminating the need for separate part sourcing or hand-fitting. Every critical wear surface including the bolt extractor carrier cam pin carrier key and firing pin is treated with FailZero s patented EXO Nickel Boron coating which provides permanent dry lubricity so the action runs smoother with less dependence on heavy oiling. This coating also increases resistance to wear and corrosion helping the carrier group hold up to extended use and harsh storage conditions alike. Reduced friction from the Nickel Boron treatment translates directly into improved cycling performance and a more consistent shooting experience. Beyond its primary fit for .450 Bushmaster the bolt and extractor are also compatible with .458 SOCOM giving builders running either big-bore cartridge a dependable option without sourcing a separate bolt. The silver finish gives the carrier group a distinctive look compared to traditional phosphate coatings while signaling its upgraded coating underneath. Constructed from steel for strength and durability the carrier group is designed to be a long-term low-maintenance solution rather than a disposable part. For AR-pattern big-bore rifle owners seeking a dependable easy-clean bolt carrier group the FailZero 450 Bushmaster Bolt Carrier Group is for sale at GrabAGun. Fail Zero 450 Bushmaster Bolt Carrier Group Specifications Manufacturer: Fail Zero Model: 450 Bushmaster Bolt Carrier Group Compatible Hosts: .450 Bushmaster .458 SOCOM Color: Silver Finish: Nickel Boron Material: Steel Description: No Hammer Available At: GrabAGun