FailZero Complete M16 Full Auto Bolt and Carrier Group (No Hammer) EXO NiB Nickel Boron BCG Fail Zero FZ-M16-NH .223 / 5.56 AR15 M4 M16


$ 139.55 


A completely assembled, ready to install M16 Bolt Carrier Group. Kit includes six critical parts that are treated with EXO Nickel Boron Technology, a revolutionary surface technology that provides permanent dry lubricity, radically improves the performance of your rifle and eliminates the need to apply oil or grease to treated parts for the life of the weapon.

Nickel Boron treated parts include:

  • Carpenter 158 Bolt & Extractor (5.56/.223 compatible)
  • 8620 Tool Steel Bolt Carrier
  • Extractor
  • Cam Pin
  • Carrier Key
  • Firing Pin


  • All Fail Zero bolts are MPI tested and live fire tested.
  • These Fail Zero BCG's may or may not have the dark logo or the new subdued Lasered logo.