Faxon 5.56/300 BLK Gunner Lightweight Bolt Carrier Group, Nitride

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Key Features

  • 9310 tool steel bolt
  • Full mil-spec heat treatment
  • Salt bath nitrided bolt and carrier
  • Superfinished carrier body
  • Magnetic particle inspected
  • Bolt lugs are chamfered 45°
  • S7 extractor
  • Full-auto rated

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Noticing a lack of good, robust, lightweight BCGs in the marketplace, Faxon® set out to create a Bolt Carrier Group with mil-spec or better constrution, forward assist, and full-auto capability…and it had to weigh as little as possible.

With that, the Gunner Lightweight Bolt Carrier Group was born. As with Faxon's barrels, they selected the QPQ method of salt bath nitride for all carrier components. By coating all parts, the carrier's natural slickness is enhanced—requiring less gas and pressure to operate. The salt bath nitride process also seals components against corrosion while making them fantastically wear-resistant.

Other improvements include the use of 9310 tool steel for the bolt, which is stronger than C158 and other common materials. The nitriding process helps to increase surface hardness, decrease friction resistance, and provide superior corrosion compared to standard chrome and phosphated finishes.

All bolts are fully MPI-tested to ensure the material is sound and without defects. Bolt lugs are chamfered 45° 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. 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.

  • 9310 tool steel construction
  • Full mil-spec heat treatment
  • Shot-peened to mil-spec
  • MPI-inspected
  • Back of lugs chamfered for reliability
  • Spring, insert, and "crane" O-ring installed
  • Salt bath nitrided
  • S7 tool steel construction
  • Fully heat-treated
  • Shot-peened to mil-spec
    Carrier & Key:
  • Superfinished carrier
  • Key: 4140 steel
  • Fully heat-treated
  • Forward assist serrations
  • Full-auto rated
  • Grade 8 fasteners
  • Fully and properly staked key, Permatex sealed
  • Salt bath nitrided
    Cam Pin:
  • 4140 pre-hardened steel
  • Salt bath nitrided

Order today!

Key Specifications

  • Item Number: 710105
  • Caliber(s): 5.56 NATO/.300 AAC Blackout
  • Overall weight: 8.5 oz.
  • Mfg. Number: FF556BCGCNITRIDE-LW