Product Description The LANTAC USA M-SPEC Bolt Carrier Group (BCG) in 223/5.56 with a Nickel Boron (NIB) finish is a premium, military-specification bolt carrier group engineered for AR-15 platform rifles. Designed to meet and exceed mil-spec standards, this BCG features a highly durable Nickel Boron coating that significantly reduces friction and wear, enhances corrosion resistance, and makes cleaning faster and easier than traditional finishes. The M-SPEC designation reflects its adherence to military specifications, ensuring reliable feeding, extraction, and ejection in demanding conditions. At 11 inches in length and weighing approximately 0.815 lbs, it is a direct drop-in replacement for standard AR-15 bolt carrier groups chambered in .223 Remington or 5.56 NATO. Product Highlights Military-Specification Construction: Built to mil-spec tolerances for reliable, consistent performance in AR-15 rifles chambered in .223/5.56. Nickel Boron (NIB) Finish: Provides superior lubricity, corrosion resistance, and ease of cleaning compared to phosphate or standard coatings. Direct Drop-In Compatibility: Designed as a direct replacement for standard AR-15 bolt carrier groups with no modifications required. Enhanced Durability: The NIB coating reduces internal wear and friction, extending the service life of the BCG under heavy use. LANTAC USA Engineering: Crafted by a trusted manufacturer known for precision AR-15 components and accessories. Specs Brand: LANTAC USA Manufacturer Part Number (MPN): 01-MSPEC-556-NIB-BCG UPC: 614347506295 Caliber: .223 Remington / 5.56 NATO Finish: Nickel Boron (NIB) Specification: Military Specification (M-SPEC) Length: 11 inches Shipping Weight: 0.815 lbs Compatible Platform: AR-15 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. ]]>