Product DescriptionThe CMMG 55BA419 complete bolt carrier group is a Mil-Spec M16-style BCG designed for reliable function in 5.56x45mm NATO/.223 Remington platforms. Built with a 9310 steel bolt, 8620 steel carrier, and a 4140 steel extractor, this assembly features a durable phosphate finish and a chrome-lined carrier for long-lasting performance and easier maintenance. It's an ideal replacement or upgrade bolt carrier group for AR-15/M16 upper assemblies.Product HighlightsComplete Mil-Spec M16 bolt carrier group for dependable cycling and consistent reliability9310 steel bolt and 8620 steel carrier for strength and durability under high round countsChrome-lined carrier helps resist wear and simplifies cleaningPhosphate finish in black for classic Mil-Spec corrosion resistanceCompatible with M16/AR-15 pattern rifles chambered in 5.56 NATO/.223 (and commonly used with 300 BLK setups that use standard 5.56 bolts)SpecsBrand: CMMGManufacturer Part Number: 55BA419UPC: 852005002431Caliber: 5.56x45mm NATO / .223 RemingtonPlatform/Model Compatibility: M16 / AR-15 patternBolt Material: 9310 steelCarrier Material: 8620 steel (chrome-lined)Extractor Material: 4140 steelFinish: Phosphate (black)Weight: 0.8 lbCountry of Manufacture: United StatesDisclaimer: 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.