Faxon Firearms 5.56 9310 Bolt Nitride Black – AR-15 Replacement Bolt

The Faxon Firearms 5.56 9310 Bolt provides a direct replacement for worn or damaged AR-15 bolts, restoring reliable function to your rifle. Manufactured from high-strength 9310 steel—a common upgrade from standard Carpenter 158 steel—this bolt offers improved fatigue resistance for extended service life. This is a replacement component for shooters performing maintenance, completing builds, or keeping spares on hand.

The bolt is finished with salt bath nitride (QPQ) for exceptional hardness and corrosion resistance. Nitride treatment penetrates the steel surface rather than coating it, maintaining tight tolerances while providing a durable, low-friction finish. This is a complete bolt assembly ready for installation into a standard AR-15 bolt carrier. Installation requires basic armorer knowledge and proper headspace verification with go/no-go gauges before firing.

• Part Type: Bolt Assembly
• Compatible Firearms: AR-15, 5.56 NATO/.223 Rem chamberings
• Material: 9310 Steel
• Finish: Salt Bath Nitride (Black)
• Installation: Professional Recommended – Requires Headspace Verification
• Includes: Bolt Assembly (carrier not included)