FAXON 9310 .458 SOCOM/.450 BUSHMASTER BOLT - .125 - NITRIDE
Faxon
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Faxon
FAXON 9310 .458 SOCOM/.450 BUSHMASTER BOLT - .125 - NITRIDE
Description
Specifications
| Part number | FF458BCNITRIDE |
| Platform | AR-15 / M16 |
| Bolt face | .125 |
| Bolt material | 9310 steel |
| Bolt heat treat | Full mil-spec heat treatment, shot peened |
| Bolt inspection | Magnetic particle inspected (MPI) |
| Lugs | Back of lugs chamfered |
| Extractor | S7 tool steel, heat treated and shot peened; spring, insert and “Crane” O-ring installed |
| Finish | Salt bath nitride |
| UPC | 816341024175 |
| Made in | USA |
| Warranty | Faxon Lifetime Guarantee |
Fitment
| Calibers | .458 SOCOM and .450 Bushmaster AR-15 barrels |
| Carrier | Standard AR-15 / M16 carrier |
| Complete BCG | .458 / .450 BCG |
Headspace is set between the bolt and the barrel extension, so a new bolt must be checked with go/no-go gauges before firing unless Faxon headspaced it to your barrel.
When to Replace a Bolt
Swap the bolt when you see cracked or chipped lugs, a cracked cam pin hole, a worn or peened bolt face, or extraction problems that a new extractor and spring don't fix. A spare bolt is also the fastest way to set up a second barrel in the same caliber family: headspace it to the new barrel and keep the pair together.
FAQs
What does “.125” mean?
It's the bolt face depth this bolt is built for. .458 SOCOM and .450 Bushmaster AR-15 barrels barrels in this family use this bolt face; always confirm your barrel's requirement and check headspace.
Is this bolt magnetic particle inspected?
Yes. Every Faxon bolt is MPI tested, a non-destructive check that finds cracks and inclusions in the steel.
Why 9310 steel instead of Carpenter 158?
9310 is a nickel-chrome-moly alloy with excellent toughness and fatigue strength, so the lugs resist cracking under repeated high-pressure cycles. More on 9310 bolts.
Why salt bath nitride instead of phosphate?
Nitride raises surface hardness and corrosion resistance and lowers friction, so the bolt runs slicker and carbon wipes off more easily.
Where is it made?
Made in the USA to Faxon designs and specifications, and headspace-checked, lot-engraved and inspected by Faxon Firearms in Fairfield, Ohio. Covered by the Faxon Lifetime Guarantee.
Can Faxon headspace this bolt to my barrel?
Faxon offers bolt-to-barrel headspace matching on FaxonFirearms.com orders that include a Faxon barrel. Read how the matching service works. If you are pairing the bolt with a barrel that was not headspaced by Faxon, check it with go/no-go gauges before firing.
Need the whole carrier group?
Faxon Lifetime Guarantee. Covers manufacturing and material defects to the original purchaser. Excludes damage from misuse, neglect, improper installation, or modifications. Normal wear of springs, extractors, gas rings and finish is not a defect. Register your product at faxonfirearms.com/product-registration. Full terms: faxonfirearms.com/warranty-privacy-terms.
Always verify headspace with go/no-go gauges when pairing a bolt with a barrel that was not headspaced by Faxon. Full-auto, forced reset and other enhanced fire control groups are regulated differently by state and locality; know and follow the laws where you live. Third-party trigger and buffer makers set their own installation requirements; follow them.
For questions, contact customerservice@faxonfirearms.com.
