Brownells Ar-308 308 Caliber Bolt Carrier Group Nickel Boron

The Brownells AR-308 .308 Caliber Bolt Carrier Group in Nickel Boron finish is a complete, ready-to-run BCG built for DPMS LR-308 pattern rifles. Whether you're running a .308 Winchester, 6.5mm Creedmoor, .243, 7mm-08, .338 Federal, .260 Remington, or other .308-based cartridge, this carrier group delivers the reliability and precision you need for accurate shooting and consistent function. The Nickel Boron coating offers a distinct advantage: it's harder than traditional finishes and self-lubricating, which means less fouling buildup and smoother operation across thousands of rounds.

Built to Brownells' own uncompromising manufacturing standards, the bolt is machined from robust 9310 steel, heat-treated and shot-peened to achieve superior hardness. The carrier itself is forged from hardened 8620 steel. Both components undergo magnetic particle inspection (MPI) to catch any microscopic flaws before they can cause premature failure downrange. The carrier features forward assist notches for reliable bolt closure, and the gas key is torqued and staked to prevent rotation. The extractor comes factory-installed with a rubber insert and spring for consistent case ejection.

This is a complete BCG—firing pin, firing pin retaining pin, cam pin, gas rings, gas key, extractor, and ejector all arrive installed and ready to drop into your upper receiver. No additional parts needed. The dull matte silver Nickel Boron finish resists wear and corrosion, and its self-lubricating properties reduce maintenance headaches on the range or in the field.

Key Features

• Complete bolt carrier group with all internal parts factory-installed
• Nickel Boron coating—harder than traditional finishes and self-lubricating
• Bolt machined from 9310 steel, heat-treated and shot-peened for superior hardness
• Carrier forged from hardened 8620 steel
• Magnetic particle inspected for hidden flaws
• Gas key torqued and staked for reliability
• Forward assist notches for consistent function
• Extractor features rubber insert and spring

Specifications

Frequently Asked Questions

Is this BCG compatible with my AR-pattern rifle?

This Brownells AR-308 bolt carrier group is designed for DPMS LR-308 pattern upper receivers chambered in .308 Winchester or other .308-based cartridges. It is NOT compatible with Armalite-pattern rifles. Confirm your upper is DPMS LR-308 spec before purchasing.

Does the Nickel Boron finish require special cleaning or lubrication?

The Nickel Boron coating is self-lubricating, which reduces fouling buildup and maintenance compared to traditional finishes. Standard rifle cleaning and lubrication practices apply, though the self-lubricating properties mean you'll see less carbon accumulation over extended shooting sessions.

What comes installed in this bolt carrier group?

This is a complete BCG. All internal parts arrive factory-installed and ready to use: firing pin, firing pin retaining pin, cam pin, gas rings, gas key, extractor with rubber insert and spring, and ejector. Drop it into your DPMS LR-308 upper and you're ready to shoot.

What makes Brownells BCGs different from standard carriers?

Brownells manufactures to exacting standards with 9310 steel bolts and hardened 8620 steel carriers, both heat-treated for superior hardness. All components are magnetic particle inspected to eliminate microscopic flaws before assembly. The gas key is torqued and staked for reliability, and you can choose between Black Nitride or Nickel Boron finishes depending on your preference for wear resistance and lubrication properties.