BattleHawk Armory AR-15 6.8 SPC / .400 Legend Black Nitride Complete Bolt Carrier Group - BCG Built to handle the added pressure and punch of big-bore AR calibers, the BattleHawk Armory 6.8 SPC / .400 Legend Complete BCG is engineered to deliver smooth cycling, rock-solid durability, and superior performance in AR-platform rifles chambered in 6.8 SPC, .400 Legend, and .450 Bushmaster. Crafted from rugged case-hardened 8620 steel and finished in corrosion-resistant Black Nitride, this bolt carrier group delivers enhanced lubricity and reduced wear-even in harsh environments or under heavy use. Whether you're running a hunting build or a tactical setup, this BCG is designed for those who demand uncompromising reliability and fit. Carrier Group: Precision-machined from 8620 case-hardened steel Finished in Black Nitride for low-friction operation and long-lasting protection Gas key made from 4130 steel, staked with Grade 8 hardware in a milled valley Hardened 4340 cam pin 8740 steel Mil-Spec firing pin, centerless ground and hard chrome coated Bolt Assembly: Made from 9310 case-hardened steel, CNC ground after heat treatment Finished in Black Nitride with shot peening for added strength 4340 extractor with Mil-Spec extractor spring & O-ring combo Fully MPI (Magnetic Particle Inspected) and HPT (High Pressure Tested) Fits: AR-15/M4-style rifles chambered in 6.8 SPC, .400 Legend, and .450 Bushmaster. Proudly made in the USA. Now available at BattleHawk Armory-engineered to perform, built to endure.