Product Description The FailZero M16 Bolt Carrier Group (BCG) comes fully assembled and ready to drop into most mil-spec M16, M4, or AR-15 upper receivers. All critical components are coated with FailZero&';s EXO Nickel Boron technology to provide permanent dry lubricity, extreme durability, and increased wear and corrosion resistance for smoother cycling and easier maintenance. Product Highlights Fully assembled bolt carrier group for quick, drop-in installation in compatible mil-spec uppers EXO Nickel Boron coating delivers permanent dry lubricity to help reduce the need for heavy lubrication Enhanced wear resistance and extreme durability for hard-use M16/M4/AR-15 platforms Improved corrosion resistance with a nickel finish for easier cleaning and long service life No-hammer configuration (as designated by the part number) for compatible builds Specs Product Type: Bolt Carrier Group (BCG) Platform Compatibility: Mil-spec M16, M4, and AR-15 upper receivers Coating/Finish: EXO Nickel Boron; Nickel finish Assembly: Completely assembled Hammer: Not included Brand: FailZero Manufacturer Part Number: 009-FZM16/4-01-NH UPC: 881314861781 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.