Product Description The Faxon Firearms FF308BCNITRIDE bolt carrier group is built for .308 Winchester and 6.5 Creedmoor platforms and finished in Black Nitride for enhanced durability and corrosion resistance. The bolt is made from 9310 tool steel and the entire assembly is nitrided to increase surface hardness and reduce friction compared to typical chrome and phosphated bolt carrier groups. For added confidence and reliability, bolts are fully magnetic particle inspected (MPI) to help ensure the material is sound and free of defects. A 45-degree chamfer on the bolt lugs promotes reliable cycling, even with higher-pressure handloads and fast, lightweight actions. The extractor is crafted from S7 tool steel and uses a spring, O-ring, and silicone insert for consistent extraction performance. Product Highlights Black Nitride treated assembly for increased surface hardness, reduced friction, and improved corrosion resistance 9310 tool steel bolt engineered for strength and long service life Magnetic particle inspected (MPI) bolt for verified material integrity 45-degree chamfered bolt lugs designed to enhance reliability under demanding loads S7 tool steel extractor with spring, O-ring, and silicone insert for dependable extraction Specs Brand: FAXON FIREARMS Manufacturer Part Number: FF308BCNITRIDE UPC: 816341020900 Compatibility: .308 Winchester / 6.5 Creedmoor Type: Full-auto profile bolt carrier group Finish: Black Nitride Bolt Material: 9310 tool steel Extractor Material: S7 tool steel Testing: MPI tested bolt Bolt Lug Detail: 45-degree chamfered lugs Extractor Springing: Spring, O-ring, and silicone insert 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.