This FailZero 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 permanent dry lubricity, extreme durability, and increases both wear and corrosion resistance.  FailZero’s patented Nickel Boron coating will reduce friction and improve the overall performance of your rifle.

Nickel Boron treated parts include:

• Bolt & Extractor (5.56/.223/300 Blackout compatible)
• Bolt Carrier
• Extractor
• Cam Pin
• Carrier Key
• Firing Pin

Note: A full-auto M16 bolt carrier group will not make an AR-15 fully automatic on its own — accomplishing that requires a few other parts, some paperwork, and a fat stack of cash. Purchasing a full-auto  BCG requires no special paperwork,

FailZero’s parent company, UCT Coatings, Inc., is the undisputed Pioneer of Nickel Boron Technology. 15 years ago, they developed a patented Nickel Boron (NiB) formulation and proprietary processes that produce the highest boron content in the industry – which directly correlates to material hardness and wear endurance.
FailZero was launched in 2009, combining the world’s best NiB coating with the highest quality Mil-Spec components to produce the best Bolt Carrier Group on the planet!