The 6.5 Grendel bolt carrier group (BCG) is designed for straightforward installation into most Mil-Spec upper receivers chambered in 6.5 Grendel (Type 2). It arrives fully assembled and equipped with EXO nickel boron coating on all critical parts. This advanced coating technology offers permanent dry lubricity, exceptional durability and enhances wear and corrosion resistance. EXO nickel boron ensures easy cleanup and maintenance while significantly improving the overall performance of your rifle. It's an ideal choice for shooters seeking enhanced reliability and longevity from their firearm components.