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Faxon 5.56 9310 AR-15 Bolt – Nitride Complete Assembly
When reliability matters, the Faxon 5.56 9310 Bolt Complete – Nitride delivers. Built from high-grade 9310 tool steel and fully MPI tested, this bolt is engineered to outperform standard mil-spec components. Whether you're replacing a worn-out part or upgrading your current setup, Faxon’s bolt ensures smooth, consistent function in any AR-15 chambered in 5.56 NATO.
This complete bolt assembly features a QPQ nitride finish for superior surface hardness, corrosion resistance, and slick operation. Faxon also chamfers the bolt lugs at 45 degrees to improve feeding and reduce wear — ideal for lightweight builds or high-pressure loads. It’s designed to work seamlessly in both direct impingement and piston-driven systems, including tight-tolerance carriers like Adams Arms.
Made in the USA and built to handle serious use, this is the go-to spare or primary bolt for builders who won’t settle for average.
🔧 Key Features:
- 9310 tool steel construction for high strength
- QPQ nitride coating for wear and corrosion resistance
- Fully MPI tested to ensure defect-free performance
- 45° chamfered bolt lugs for smooth cycling
- Compatible with most AR-15 BCGs and piston carriers
- Made in the USA
Need to complete your upper build? This Faxon 9310 AR-15 bolt is a perfect match for premium AR-15 bolt carrier groups and compatible AR-15 upper receivers.
Looking for more from Faxon? Explore our complete line of Faxon Firearms parts, including barrels, BCGs, and gas system components — all backed by industry-leading quality and U.S. manufacturing.
Finish your setup right with trusted AR-15 parts or check out our selection of high-performance AR-15 barrels designed to run flawlessly with this bolt.
❓ Frequently Asked Questions
Q: What calibers is this bolt compatible with?
A: This complete bolt is designed for 5.56 NATO, .223 Rem, and .300 Blackout AR-15 platforms.
Q: What is 9310 steel and why is it better?
A: 9310 steel offers superior tensile strength compared to standard Carpenter 158 steel — it’s harder, more durable, and extends bolt life.
Q: Is this bolt MPI tested?
A: Yes, every bolt is Magnetic Particle Inspected (MPI) to ensure there are no cracks or flaws in the material.
Q: Will this fit in my Adams Arms or other piston system carrier?
A: Yes, this bolt works well with tight piston carriers like Adams Arms, thanks to precise machining and clean gas ring fit.
Q: Is the extractor pre-installed?
A: Yes, this is a complete bolt, fully assembled and ready to drop into your AR-15 bolt carrier group.
WARNING: This product can expose you to Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to - www.P65Warnings.ca.gov.
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