Enhance your AR-15's performance with the Guntec USA GT-BCG Nitride Bolt Carrier Group, designed for superior reliability and durability. This Mil-Spec BCG features a nitrogen-enriched finish for improved wear resistance and longevity, ensuring smooth operation in high-stress environments. Mil-Spec construction for guaranteed compatibility 8620 Steel Bolt Carrier 9310 Bolt MPI (Magnetic Particle Inspected) Nitride finish for enhanced corrosion resistance Precision machined for consistent performance Lightweight design for improved handling Upgrade your shooting experience with the reliability and quality of the Guntec USA GT-BCG.