Description
The Faxon Firearms 5.56 / .223 9310 Bolt is a stripped replacement bolt for an AR-15 bolt carrier group, machined from 9310 tool steel and finished in black nitride. This is the bolt head only – it drops into your existing BCG carrier in place of the factory 8620 mil-spec bolt. The cam pin, firing pin, retaining pin, and carrier are not included.
Key features:
- 9310 tool steel – higher hardness than 8620 mil-spec
- S7 tool steel extractor for long-cycle durability
- Nitride finish – lower friction, better corrosion resistance than phosphate
- Bolt lugs chamfered 45 degrees for reliable feeding even on hot hand loads
- Fully MPI (magnetic particle inspected) – verified material soundness
- HP (high-pressure) tested
- Mil-spec dimensions – fits any standard AR-15 / 5.56 / .223 BCG carrier
What you get:
- 1x Faxon 5.56 / .223 9310 stripped bolt (nitride)
- Pre-installed extractor + spring
Not included: carrier, cam pin, firing pin, retaining pin. Reuse the parts from your existing BCG, or pair this bolt with a separately purchased carrier and small-parts kit if you are building a BCG from scratch.
Best for: Replacing a worn or cracked factory bolt without replacing the entire BCG, or upgrading a mil-spec 8620 bolt to a harder 9310 piece for high-round-count training, suppressed builds, or duty rifles.
