Failzero Fail Zero Bolt Carrier Group BCG .450 Bushmaster Ar-15. The FAILZeroBCG is a .450-caliber bolt carrier group that reliably cycles .450-caliber ammunition without fail or damage. This FAILZeroBCG is purpose-built and built to last. The carrier comes with an SHORT BCG Home Straight line Striker and T-marked gas key. Attached to this BCG is the FAILZeroSHORT BCG Home Straight line Short recoil pad. Home owners who want high quality shooting gear for their AR can look no further than FailZero. FailZero products are designed to be the ultimate in reliability and durability backed by a limited lifetime warranty. Specifications for Failzero Fail Zero Bolt Carrier Group .450 Bushmaster Ar-15: Type/color: Ar15 complete bolt carrier Size/finish: .450 bushmaster/classic finish Material: Steel Other features: Exo nickel boron treated drop in install for most mil-spec .450 bushmaster uppers Package Contents: Failzero Fail Zero Bolt Carrier Group .450 Bushmaster Ar-15 The Failzero Fail Zero Bolt Carrier Group .450 Bushmaster Ar-15 is a quality addition to the FailZero lineup. For more great deals on Bolt Carrier Groups by FailZero please browse our FailZero Gun Parts page. What firearm models does the manufacturer say Failzero Fail Zero Bolt Carrier Group (BCG) .450 Bushmaster Ar-15 is compatible with? The manufacturer suggests that Failzero Fail Zero Bolt Carrier Group (BCG) .450 Bushmaster Ar-15 is compatible with AR-15