Product DescriptionThe FailZero M16/M4 Bolt Carrier Group (BCG) is a fully assembled, drop-in upgrade designed to fit most mil-spec M16, M4, and AR-15 upper receivers. Critical components are treated with FailZero&&';;s EXO Nickel Boron technology to deliver permanent dry lubricity, extreme durability, and enhanced wear and corrosion resistance for smoother cycling and easier maintenance.Product Highlights Fully assembled bolt carrier group ready to install in most mil-spec M16/M4/AR-15 upper receivers EXO Nickel Boron treatment provides permanent dry lubricity for smooth operation Enhanced wear resistance for improved long-term durability under hard use Corrosion-resistant coating helps protect critical BCG components Matte finish and "No Hammer" configuration as specified by the manufacturer Specs Product Type: Bolt Carrier Group (BCG) Platform Compatibility: Most mil-spec M16, M4, and AR-15 upper receivers Coating/Treatment: EXO Nickel Boron Key Benefits: Dry lubricity, extreme durability, wear resistance, corrosion resistance Configuration: No Hammer Finish: Matte UPC: 094922034977 Manufacturer Part Number: FZ-M164-01-NH-MATTE Brand: FailZero Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product&&';;s manufacturer.