The FailZero M16/M4 Bolt Carrier Group with EXO nickel boron coating delivers reliable cycling without the need for traditional lubricants.
- Part Type: Bolt Carrier Group (Full-Auto Profile)
- Compatible Firearms: M16/M4, AR-15 (5.56 NATO/.223 Rem)
- Material: Mil-Spec Steel
- Finish: Black Nitride with EXO Nickel Boron Coating
- Installation: Drop-In
- Includes: Bolt Carrier, Bolt Assembly, Gas Key, Cam Pin, Firing Pin Retaining Pin (No Firing Pin Hammer)
