Toolcraft 6.5 Grendel / 6mm ARC Bolt Carrier Group - Nickel Boron

Toolcraft 6.5 Grendel / 6mm ARC Bolt Carrier Group – Nickel Boron

The Toolcraft 6.5 Grendel / 6mm ARC Bolt Carrier Group – Nickel Boron is a premium full-auto M16 BCG engineered for AR-15 rifles chambered in either 6.5 Grendel or 6mm ARC. Built using a 9310 steel bolt and 8620 steel carrier, this bolt carrier group is fully manufactured and coated by Toolcraft in the U.S.A. The Nickel Boron (NiB) finish enhances lubricity and wear resistance while providing excellent corrosion protection, making it ideal for extended use in rugged environments.

This BCG features a Type II bolt with a .136″ bolt face depth, optimized for reliable performance with 6.5 Grendel and 6mm ARC cartridges. The machined D2 tool steel extractor, Mil-Spec O-ring, and triple gas rings ensure consistent extraction and cycling, even under high pressure. The bolt is both shot peened and MPI inspected to verify structural integrity and readiness for duty-grade performance.

The Nickel Boron coating is applied to both the bolt and carrier, creating an ultra-smooth, easy-to-clean surface that resists carbon fouling and minimizes friction during operation. The gas key is secured with Grade 8 fasteners and properly staked to prevent loosening over time. The 8620 steel cam pin and 416 stainless steel firing pin further contribute to the BCG’s overall reliability and longevity.

This Toolcraft 6.5 Grendel / 6mm ARC BCG is manufactured to M16 full-auto specifications for increased mass and reliability, making it suitable for both semi-auto and full-auto applications. Whether you’re building a precision rifle for long-range shooting or upgrading your current setup for improved function, this BCG is a dependable and high-performance choice.

All Toolcraft Bolt Carrier Groups sold by Arm or Ally are manufactured and coated in-house by Toolcraft and backed by their no-questions-asked lifetime warranty. Products coated by third-party vendors are not eligible for this warranty. Trust Arm or Ally, the internet’s largest authorized Toolcraft dealer, for factory-direct quality and support.