Faxon 5.56 9310 Nitride Bolt — Black

Description

The Faxon Firearms 5.56 9310 Nitride Bolt is an upgraded AR-15 bolt engineered for durability and consistent function in 5.56 NATO platforms. Built from 9310 tool steel and finished with a black nitride process, the bolt offers improved surface hardness and enhanced corrosion resistance compared with typical phosphated bolts. Each assembly receives magnetic particle inspection to verify material integrity. Bolt lugs are chamfered 45 degrees and the extractor uses S7 tool steel with a spring, o-ring, and silicone insert for reliable engagement and extraction.

Key Specifications

• The bolt is specified for 5.56 NATO use.
• Construction is from 9310 tool steel.
• The finish is Black Nitride for improved surface hardness and corrosion resistance.
• Each assembly is MPI tested to ensure material integrity and absence of defects.
• Bolt lugs are chamfered at 45 degrees to promote reliable lockup.
• The extractor is made from S7 tool steel for durability.
• The extractor is sprung using a spring, o-ring, and silicone insert for consistent tension.
• Designed to exceed basic MIL-SPEC starting points through upgraded materials and finishing.

Purpose-built for builders and owners who prioritize durability and reliable cycling, this Faxon bolt combines hardened materials, proven testing, and precise machining. It provides a robust upgrade path for 5.56 NATO AR platforms where enhanced surface hardness, corrosion resistance, and consistent extractor performance are important for long-term service life and dependable operation.