Wilson Combat TRBCAPNIB Bolt Carrier Assembly 5.56 NATO Nickel

The Wilson Combat TRBCAPNIB Bolt Carrier Assembly delivers enhanced reliability and corrosion resistance for AR-15 platforms chambered in 5.56 NATO/.223 Remington. This precision-manufactured bolt carrier group features a nickel-plated stainless steel construction that reduces friction and extends service life beyond standard mil-spec components.

What Makes This Different

Unlike standard phosphate-coated bolt carriers, this Wilson Combat assembly utilizes electroless nickel plating over stainless steel for superior corrosion resistance and easier cleaning. The nickel coating reduces friction coefficients by approximately 15% compared to standard finishes, resulting in smoother cycling and reduced wear on critical contact surfaces. Heat treatment processes ensure the bolt maintains proper hardness ratings while the carrier provides optimal gas pressure management.

Key Features

• Electroless nickel-plated stainless steel construction for maximum corrosion resistance
• Precision-machined bolt with properly staked gas key and Grade 8 fasteners
• Enhanced extractor with improved spring tension for reliable ejection
• Shot-peened bolt for stress relief and extended service life
• Compatible with all mil-spec AR-15 upper receivers and .223/5.56 NATO chambers
• Magnetic particle inspected components meet or exceed TDP specifications
• Includes bolt, carrier, firing pin, retaining pin, cam pin, and gas rings

This bolt carrier assembly maintains consistent lockup and timing across thousands of rounds, making it suitable for competitive shooting, law enforcement applications, and precision rifle builds. The nickel coating resists fouling buildup and simplifies maintenance procedures, while the stainless steel substrate provides long-term dimensional stability. Field testing demonstrates reliable function in temperatures ranging from -40°F to 140°F with various ammunition weights from 55 to 77 grains.

Technical Specs

• Caliber: 5.56 NATO/.223 Remington
• Material: Stainless steel with electroless nickel plating
• Bolt extension: 8620 steel, properly headspaced
• Gas key: Grade 8 screws, properly staked and sealed
• Weight: Approximately 11.2 ounces complete assembly
• Compatibility: Mil-spec AR-15 upper receivers
• Finish: Electroless nickel over stainless steel
• Manufacturing: CNC machined in USA

Wilson Combat's reputation for precision manufacturing ensures this bolt carrier assembly meets exacting tolerances required for consistent accuracy and reliability. The investment in premium materials and advanced coatings translates directly to reduced maintenance intervals and extended component life in demanding applications.