Faxon 9310 5.56 AR-15 Bolt .125 Nitride MPI
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The Faxon 9310 5.56 bolt (.125) is a high-quality AR-15 replacement bolt featuring 9310 tool steel construction with MPI inspection, MIL-SPEC heat treatment, and shot peening. Bolt lugs are chamfered for reliable cycling, and the extractor is made from S7 tool steel with a spring, silicone insert, and “Crane” O-ring installed. The bolt is finished with salt bath nitriding for hardness and corrosion resistance.
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, and “Crane” O-ring installed
- Salt bath nitrided finish
Extractor
- S7 tool steel construction
- Fully heat treated
- Shot peened per MIL-SPEC
Notes
- “.125” refers to the bolt face depth specification commonly used in 5.56/.223 AR-15 bolts—confirm compatibility with your barrel.
Specifications
- Manufacturer:
- Faxon Firearms
- Category:
- bolt-carrier-group
- Caliber:
- 5.56x45mm NATO
- Platforms:
- AR-15
- UPC:
- 816341020863
- MPN:
- FF556BCNITRIDE
- Required Component:
- Yes
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$45.78
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