Faxon Firearms FF556BCGCNITRIDE M16 Bolt Carrier Group 5.56 NATO

The Faxon Firearms FF556BCGCNITRIDE M16 Bolt Carrier Group delivers enhanced reliability and extended service life for AR-15 platform rifles. This full-auto rated BCG features premium 9310 steel construction with salt bath nitride coating for superior corrosion resistance and reduced friction.

What Makes This Different

Unlike standard phosphate-coated bolt carriers, this unit utilizes salt bath nitride treatment that penetrates the steel surface rather than simply coating it. The process creates a hardened layer measuring 65-70 HRC that resists wear and corrosion significantly better than traditional finishes. The 9310 steel bolt provides 25% greater tensile strength compared to standard Carpenter 158 steel bolts.

Key Features

• Full-auto M16 profile carrier compatible with semi-auto and full-auto applications
• 9310 steel bolt with superior fatigue resistance and impact strength
• Salt bath nitride coating reduces friction and eliminates break-in period
• Properly staked gas key with Grade 8 fasteners and Loctite application
• Shot-peened bolt for stress relief and crack prevention
• Chrome-lined gas key interior for corrosion protection
• Compatible with standard AR-15/M16 barrel extensions and chambers

This BCG maintains consistent cycling across various ammunition weights from 55-grain to 77-grain projectiles. The nitride coating retains lubricity even under adverse conditions, making it suitable for high-volume training, competitive shooting, and tactical applications. The enhanced surface hardness extends cleaning intervals while maintaining reliable extraction and ejection.

Technical Specs

• Caliber: 5.56x45mm NATO/.223 Remington
• Bolt Material: 9310 steel, shot-peened
• Carrier Material: 8620 steel
• Finish: Salt bath nitride (Melonite/QPQ process)
• Profile: M16 full-auto carrier
• Gas Key: Chrome-lined, properly staked
• Weight: Approximately 11.2 ounces
• Manufacturer: Faxon Firearms
• Country of Origin: United States

This bolt carrier group represents a significant upgrade over mil-spec components without the premium pricing of exotic coatings. The combination of superior materials and proven surface treatment delivers measurable improvements in reliability and longevity.