The Faxon Superfinished 5.56 Gunner Lightweight Bolt Carrier Group – Chameleon PVD is a premium reduced-mass BCG engineered to deliver fast, smooth cycling without compromising strength or reliability. When we evaluated the lightweight BCG market, we saw a capability gap—so we built a carrier that could live up to the Gunner name with no compromises.

The design target was simple: the lightest weight possible—8.5 ounces complete—while retaining critical functionality including forward assist serrations, compatibility with dust covers, and an M16 pattern carrier that maintains the full-auto trip sear for full-auto and many modern multi-stage trigger systems.

Matching our barrels, we selected salt bath nitride for all carrier components to increase surface hardness, reduce resistance, and provide excellent corrosion resistance. This model adds a durable Chameleon PVD coated carrier & gas key for enhanced wear resistance and a unique color-shifting finish.

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 long-term service. After passing all quality inspections, carriers are laser-engraved with the Faxon Shield.

Faxon recommends the use of an adjustable gas block with our Gunner Lightweight BCG for proper function and optimal tuning.

DISCLAIMER: Chameleon PVD coloration will vary. No two Chameleon PVD products have the exact same coloring due to the nature of the coating process.

Key Performance Design Goals

• Lightest weight possible — 8.5 oz complete
• MIL-SPEC materials and finishes or better
• Forward assist serrations
• Compatible with dust covers
• M16 pattern — maintains full-auto trip sear compatibility
  

Specifications

Bolt

• 9310 Tool Steel Bolt
• 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
• Salt Bath Nitrided Bolt & Carrier
• Chameleon PVD Carrier & Gas Key
• S7 Extractor
• Superfinished Carrier Body
• Full Auto Compatible
• Forward Assist Serrations

Note: Bolt carrier groups used with barrels not specifically headspaced by Faxon must be checked for proper headspace prior to firing. Faxon recommends Pacific Tool & Gauge headspace kits for all measurements.

Frequently Asked Questions

Is this bolt carrier group full-auto compatible?

Yes. This is an M16-pattern carrier that maintains the full-auto trip sear and is compatible with full-auto fire control groups and many modern multi-stage triggers.

Why does a lightweight BCG often require an adjustable gas block?

Reduced-mass carriers typically require less gas to cycle efficiently. An adjustable gas block allows you to tune gas flow for reliability, recoil control, and component longevity—especially when changing ammo or running suppressed.

Will my Chameleon PVD BCG look exactly like the photos?

Not necessarily. Chameleon PVD coloration will vary, and no two Chameleon PVD products have the exact same coloring. This variation is normal and expected.