Faxon Bolt Carrier Groups are Superfinished to reduce friction, increase smoothness of operation, and reduce fouling. Further, they are full-Auto rated and maintain the trip for full-auto fire control groups and new multi-stage trigger systems. Gas keys use grade 8 fasteners and are fully staked for a lifetime of service.

Improvements include using 9310 tool steel for the bolt, which is stronger and 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. Seeing "MIL-SPEC" as just the starting point, we set out to ensure the best options are available for our demanding customers.

Features and Specifications:
Manufacturer Number: FF556BCGCNITRIDE
Bolt:
9310 Tool Steel Construction (Stronger than C158)
Full MIL-SPEC Heat Treatment
Shot Peened to MIL-SPEC
Magnetic Particle Inspection (MPI)
Back of Lugs Chamfered for Reliability
Spring, Insert, & "Crane" O-Ring Installed
QPQ - Salt Bath Nitrided

Extractor:
S7 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
M16 (FULL-AUTO) Compatible
Grade 8 Fasteners
Fully & Properly Staked Key, Permatex Sealed
QPQ - Salt Bath Nitrided

Cam Pin:
4140 Pre-Hardended Steel Material
QPQ - Salt Bath Nitride