FailZero

The FailZero FZ-AR15-01-NH-BLACK is the black finish variant of FailZero's industry-leading EXO Nickel Boron Bolt Carrier Group, purpose-built for mil-spec AR-15 upper receivers chambered in 5...

The FailZero FZ-7.62X39-01-NH is a fully assembled, drop-in ready 7.62x39 Bolt Carrier Group coated in FailZero's patented EXO Nickel Boron technology and purpose-built for AR-15 platform rifles...

The FailZero FZ-M16-NH is a fully assembled, drop-in ready M16/M4 Bolt Carrier Group coated in FailZero's patented EXO Nickel Boron technology — the most advanced bolt carrier group coating in...

This Bolt Carrier Group (BCG) comes fully assembled and ready to drop into most mil spec M16, M4 or AR15 upper receivers. All critical parts are coated with EXO Nickel Boron technology that provides...

This Bolt Carrier Group (BCG) comes fully assembled and ready to drop into most mil spec M16, M4 or AR15 upper receivers. All critical parts are coated with EXO Nickel Boron technology that provides...

FailZero, M16/M4 Bolt Carrier Group, No Hammer, Black Nitride Coated, Black Finish High quality components and precise manufacturing make FailZero parts ideal for maintaining and upgrading firearms...

Put the latest and greatest technology into your AR-15 rifle, starting with one of the most important parts: the firing pin. This drop in part is coated with the patented EXO technology, and will...