Improvements include using 9310 tool steel for the bolt, nitriding the assembly to increase surface hardness, decrease resistance, and have superior corrosion resistance compared to typical chrome and phosphasted bolt carrier groups. All bolts are fully MPI tested to ensure the material is sound and without defects. Bolt lugs are chamfered 45 degrees to ensure reliable action for even the highest pressure hand loads and fast lightweight actions. 

Faxon Bolt Carrier Groups are Superfinished to reduce friction, increase smoothness of operation, and reduce fouling. Gas keys use grade 8 fasteners and are fully staked for a lifetime of service. 

DPMS Gen 1 Compatible

Detailed Specifications:

Bolt:

• 9310 Tool Steel Construction (Stronger than C158)
• Full MIL-SPEC Heat Treatment
• Shot Peened to MIL-SPEC
• Back of Lugs Chamfered for Reliability
• Nested .308 Spec Springs with O-Ring
• QPQ – Salt Bath Nitrided

Extractor:

• 4140 Tool Steel Construction
• Fully Heat Treated
• Shot Peened Per MIL-SPEC
• QPQ – Salt Bath Nitrided

Carrier & Key:

• Superfinished Carrier
• Carrier: MIL-SPEC 8620 Steel Material
• Key: 4140 Steel Material
• Fully Heat Treated
• Forward Assist Serrations
• Grade 8 Fasteners
• Fully & Properly Staked Key
• QPQ – Salt Bath Nitrided

Cam Pin:

• 4140 Pre-Hardened Steel Material
• QPQ – Salt Bath Nitrided

Note – Bolt carriers ordered and deployed with barrels not specifically checked by Faxon for headspacing MUST be checked to ensure safe and reliable function. Faxon recommends Pacific Tool & Gauge headspace kits for all measurements.