Product Description The LBE Unlimited M16 Complete Bolt Carrier Group (BCG) is a premium, full-auto rated component engineered for AR platform rifles chambered in 5.56x45mm NATO. The bolt is precision-machined from 9310 tool steel for superior strength and durability, while the carrier body is constructed from tough 8620 steel. The entire assembly receives a Nickel Boron (NiB) coating, providing exceptional corrosion resistance, reduced friction, and easier cleaning. A properly staked gas key ensures a secure, gas-tight fit during sustained fire. This complete BCG ships ready to install and includes all necessary components for drop-in functionality. Product Highlights Premium Steel Construction: Bolt machined from 9310 tool steel and carrier from 8620 steel for maximum reliability and longevity. Nickel Boron (NiB) Coated: Full NiB coating reduces friction, enhances corrosion resistance, and simplifies maintenance. Full Auto Rated: Built to mil-spec M16 standards and rated for full-auto fire cycles on compatible AR platform rifles. Staked Gas Key: Properly staked gas key prevents loosening under high-heat, high-cycle conditions for consistent performance. Complete Assembly: Includes firing pin, retaining pin, cam pin, extractor, and bolt gas rings for immediate installation. Specs Brand: LBE Unlimited Model: M16BCG-NIB MPN: M16BCGNIB UPC: 784682014578 Caliber/Cartridge: 5.56x45mm NATO Platform: AR Platform Bolt Material: 9310 Tool Steel Carrier Material: 8620 Steel Coating/Finish: Nickel Boron (NiB) Gas Key: Staked Fire Rating: Full Auto Rated Included Components: Firing Pin, Retaining Pin, Cam Pin, Extractor, Bolt Gas Rings 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. ]]>