Product DescriptionThe Faxon Firearms 5.56 NATO M16 Bolt Carrier Group (BCG) in Chameleon PVD is a premium AR-15/M16 upgrade built for shooters who want smooth cycling, strong corrosion resistance, and dependable function under hard use. Faxon treats MIL-SPEC as a baseline, enhancing key wear surfaces and critical components for long-term reliability. The bolt is made from 9310 tool steel, fully heat treated, shot peened, and Magnetic Particle Inspected (MPI) to help ensure material integrity. The bolt and carrier are salt bath nitrided to increase surface hardness and improve corrosion resistance, while the carrier and gas key feature a color-shifting Chameleon PVD coating for added wear resistance and a distinctive finish.Reliability-focused details include chamfered bolt lugs for consistent cycling, an S7 extractor, and a spring/insert/"Crane" O-ring installed. As an M16-pattern carrier, it is full-auto compatible, making it a strong choice for duty rifles, training carbines, and high-round-count setups where durability and ease of maintenance matter.Product Highlights 9310 tool steel bolt with MIL-SPEC heat treatment, shot peening, and MPI testing for confidence in critical parts Salt bath nitride treatment on bolt and carrier enhances surface hardness and corrosion resistance Chameleon PVD coated carrier and gas key deliver a unique color-shifting finish with added wear resistance Chamfered bolt lugs plus extractor spring/insert/"Crane" O-ring installed to support reliable cycling M16-pattern, full-auto compatible carrier design for AR-15/M16 platformsSpecs Brand: Faxon Firearms Product Type: Bolt Carrier Group (BCG) Platform Compatibility: AR-15 / M16 Caliber: 5.56 NATO Carrier Pattern: M16 (full-auto compatible) Bolt Material: 9310 tool steel Extractor Material: S7 tool steel Inspection: Magnetic Particle Inspection (MPI) Surface Treatment: Salt bath nitrided bolt & carrier Coating: Chameleon PVD coated carrier & gas key Manufacturer Part Number: FF556BCGCNITRIDE-NCR UPC: 816341024649Disclaimer: 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.