FAXON AR-15 5.56/300 BLK BOLT - 9310 NITRIDE


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FAXON AR-15 5.56/300 BLK BOLT - 9310 NITRIDE

Detailed Specifications:


  • 9310 Tool Steel Construction (Stronger than C158)
  • Full MIL-SPEC Heat Treatment
  • Shot Peened to MIL-SPEC
  • Magnetic Particle Inspection (MPI)
  • Back of Lugs Chamfered for Reliability
  • Spring, Insert, & "Crane" O-Ring Installed
  • QPQ - Salt Bath Nitrided



  • S7 Tool Steel Construction
  • Fully Heat Treated
  • Shot Peened Per MIL-SPEC
  • QPQ - Salt Bath Nitrided


Note - Bolts ordered and deployed with barrels not specifically checked by Faxon for headspacing MUST be checked to ensure safe and reliable function. Faxon recommends Pacific Tool & Gauge headspace kits for all measurements. For detailed instructions on headspacing, see our blog post for instructions.