FailZero EXO Nickel Boron M16 / M4 5.56 Bolt Carrier Group



The First in Nickel Boron Coated BCG’s



The FailZero EXO Nickel Boron M16 / M4 556 Bolt Carrier Group comes fully assembled and ready to drop into most mil spec AR15 upper receivers. Featuring an expertly machined 8620 Steel Carrier and Carpenter 158 Steel bolt, both shot peened, Magnetic Particle Inspected (MPI) and High Pressure Tested (HPT). All critical parts are coated with EXO Nickel Boron technology that provides permanent dry lubricity, extreme durability and increases both wear and corrosion resistance. Our patented Nickel Boron coating will reduce friction and improve the overall performance of your rifle. Our FailZero carriers are laser etched with the FailZero logo, and are 100% made in North Carolina, USA.

Nickel Boron treated parts include: