FailZero 5.56/.223 Bolt Assembly

A 5.56/.223 Nickel Boron Bolt Assembly for AR15, M16 and M4 Carriers


This fully assembled and NiB coated (5.56/.223) bolt assembly is compatible with most mil spec AR15, M16, M4 Carriers.  EXO Nickel Boron provides permanent dry lubricity; increased wear and corrosion resistance.  By reducing friction this bolt assembly will make for easy cleanup and improve the performance of your rifle.

Nickel Boron treated parts include:

  • EXO Coated Bolt - Case Hardened, Shot Peened and MPI (Magnetic Particle Inspected)
  • EXO Coated Extractor (fully assembled)
  • All other components are Mil-Spec


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by FailZero