Toolcraft 450 Bushmaster Bolt Carrier Group - Black Nitride

Toolcraft 450 Bushmaster Bolt Carrier Group – Black Nitride

The Toolcraft 450 Bushmaster Bolt Carrier Group – Black Nitride is a purpose-built, full-auto profile BCG engineered for AR-15 rifles chambered in 450 Bushmaster. Made in the U.S.A. and backed by a no-questions-asked lifetime warranty, this BCG is constructed using premium materials and is designed to deliver long-lasting reliability in large-bore AR platforms.

The bolt is crafted from 9310 steel, shot peened for added strength, and MPI-inspected to verify structural integrity. Paired with an 8620 steel carrier, the entire assembly is finished in Black Nitride, providing enhanced surface hardness, corrosion resistance, and lubricity. This treatment reduces friction and carbon buildup, simplifying maintenance while extending service life under heavy use.

The 450 Bushmaster bolt features a machined 4140 steel extractor, Mil-Spec gas rings, and a Mil-Spec O-ring to ensure consistent case retention and proper extraction. Additional specifications include a 416 stainless steel firing pin, 8620 steel cam pin, and a 4130 steel gas key secured with properly staked Grade 8 screws. These materials are chosen for their durability and compatibility with high-pressure cartridges.

This M16 full-auto profile BCG is preferred by many AR-15 builders due to its added mass and improved cycling performance. The design is optimized for large-caliber applications like 450 Bushmaster, where strong, consistent operation is critical. Toolcraft’s reputation as a military and commercial OEM supplier ensures each unit meets demanding quality and performance standards.

All Toolcraft Bolt Carrier Groups sold by Arm or Ally are manufactured and coated directly by Toolcraft, preserving warranty coverage and product integrity. Unlike third-party re-coated units, these BCGs are backed by Toolcraft’s full lifetime warranty. For those assembling or upgrading a 450 Bushmaster AR, this Black Nitride BCG offers a dependable and professionally crafted solution.