BattleHawk Armory AR-15 6.5 Grendel / 6mm ARC / .22 ARC Nickel Boron Complete Bolt Carrier Group - BCG Maximize reliability, reduce fouling, and run cleaner for longer with the BattleHawk Armory Nickel Boron BCG, purpose-built for precision AR platforms chambered in 6.5 Grendel, 6mm ARC, and .22 ARC. Designed for shooters who demand smooth cycling and long-lasting performance, this complete bolt carrier group features a Nickel Boron (NiB) finish on both the carrier and bolt, offering unmatched lubricity, corrosion resistance, and ease of cleaning. Perfect for distance shooting, hunting, or running suppressed, the NiB finish drastically reduces friction and wear, making this BCG ideal for high-round-count builds and harsh conditions. Carrier Group: Machined from case-hardened 8620 steel Fully Nickel Boron coated for ultra-slick performance and enhanced durability Gas key made from 4130 steel, properly staked with Grade 8 hardware into a milled valley Hardened 4340 cam pin 8740 steel firing pin, centerless ground and hard chrome coated Bolt Assembly: Precision CNC-ground 9310 case-hardened steel bolt, fully Nickel Boron coated Shot peened and heat treated for long-term strength 4340 extractor with Mil-Spec extractor spring and O-ring combo Magnetic Particle Inspected (MPI) and High Pressure Tested (HPT) Fits: AR-15/M4-style rifles chambered in 6.5 Grendel, 6mm ARC, and .22 ARC Made in the USA. Now available at BattleHawk Armory-built to perform cleaner, smoother, and longer in high-demand applications.