Introducing our fully assembled Bolt Carrier Group (BCG), meticulously designed to seamlessly fit into most Mil-Spec .450 Bushmaster upper receivers. With all critical parts coated using the revolutionary EXO Nickel Boron technology, you can expect unparalleled dry lubricity, exceptional durability and increased wear and corrosion-resistance. Our patented nickel boron coating is a game changer, reducing friction and optimizing your rifle's performance to new heights. Elevate your shooting experience with our advanced BCG, ensuring smooth operation and enhanced overall rifle performance.