Faxon 5.56 9310 Bolt Complete - Nitride

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(3 reviews)
Current Stock:

Seeing "MIL-SPEC" as just the starting point, we set out to ensure the best options are available for our demanding customers. Improvements include using 9310 tool steel for the bolt, nitriding the assembly to increase surface hardness, decrease resistance, and have superior corrosion resistance compared to typical phosphated bolts. All bolts are fully MPI tested to ensure the material is sound and without defects. Bolt lugs are chamfered 45 degrees to ensure reliable action for even the highest pressure hand loads and fast lightweight actions. Extractors are S7 Tool Steel. From there, the extractor is sprung using the spring, o-ring, and silicone insert. 

Detailed Specifications:


  • 9310 Tool Steel Construction
  • 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
  • Salt Bath Nitrided


  • S7 Tool Steel Construction
  • Fully Heat Treated
  • Shot Peened Per MIL-SPEC



  • 5
    Outstand Bolt!

    Posted by Adrian on Apr 29th 2022

    This bolts are great and work really well with Adams Arms piston kit carriers. The AA carriers are cut pretty tight, and I was having issues with the gas rings on different bolts fitting with the AA carrier, but since I usually use a barrel and bolt combo - I never personally realized how easy it was to pair these bolts with AA carriers until recently I was doing a build for a friend. They picked up a brand new run of the mill bolt and it wouldn't seat in the AA carrier. Figuring it was the gas rings, I switched them out - same unfortunate issue. Ended up ordering a Faxon and putting the issue to bed.

  • 4
    great bolt

    Posted by martin derouen on Jun 15th 2019

    i got this bolt along with a barrel headspaced to this bolt. no issues at all with headspacing. extractor was stiff at first chewing up brass a little but this went away after first deep cleaning. 4 stars only because finish is wearing off already after only 500 rounds. other than that awesome product

  • 5
    So Far So Good

    Posted by JTAC1789 on Aug 16th 2016

    Machining looks top notch, only fired a few mags so far, mainly to make sure it worked. So far it works just as good as any other bolt. Great value for the price