Elevate your AR-15's performance with the Guntec USA GT-BCG-LM-TIN Low Mass Bolt Carrier Group. Crafted from durable 8620 steel, this skeletonized design ensures reduced weight while maintaining strength and reliability. The tin-coated finish enhances durability and provides a smooth operation for improved cycling. Perfect for enthusiasts seeking lightweight yet robust components, this BCG is engineered for maximum efficiency. 8620 Steel Bolt Carrier Skeletonized Low Mass Design Tin Coated (Gold Titanium Nitride Finish) Grade 8 Screws to Mil-spec 9310 Bolt MPI (Magnetic Particle Inspected) USA Made Smooth Finish To Reduce Friction 1 Year Warranty Hydraulically Staked CL Key Heat Treated For Heavy Duty Use Compatible With Dust Covers Weight: 8.6 Oz Upgrade your build with the reliability and lightweight performance of the Guntec USA GT-BCG-LM-TIN today.