Product DescriptionThe Rise Armament Nickel Boron (NiB) Bolt Carrier Group is a precision-made upgrade for AR-15 rifles chambered in .223 Remington/5.56 NATO. Built with high-quality components and a slick, corrosion-resistant nickel boron coating, this bolt carrier group is designed to help reduce friction for smoother cycling and easier cleaning. Each unit is individually MPI tested to support long-term reliability and durable performance in demanding use.Product Highlights Nickel boron coating helps reduce friction for smoother operation and easier maintenance Individually MPI tested for dependable performance and quality assurance 9310 steel bolt and 8620 tool steel carrier for strength and durability Properly staked gas key with hardened Grade 8 fasteners to help maintain gas system integrity Durable, precision manufacturing ideal for upgrades or custom AR builds Specs Product Type: Bolt Carrier Group (BCG) Platform Compatibility: AR-15 Caliber Compatibility: .223 Remington / 5.56 NATO Finish/Coating: Nickel Boron (NiB) Carrier Material: 8620 tool steel, heat treated and case hardened Bolt Material: 9310 steel, MPI tested Gas Key: Tool steel; Grade 8 hardened fasteners; properly staked Cam Pin Material: 4140 steel Extractor: Tool steel, shot peened Testing: Individually MPI tested Unit Weight: 11.6 oz UPC: 851046006040 Manufacturer Part Number: RA-1011-SLVR Brand: Rise Armament 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.