Product DescriptionThe Midwest Industries AR-15 Bolt Carrier Group (BCG) is built for dependable cycling and long service life in 5.56x45mm NATO AR-15 platforms. Finished in black nitride for enhanced wear and corrosion resistance, this mil-spec bolt carrier group is precision manufactured and heat treated to help deliver consistent reliability for maintenance, upgrades, or new builds. Includes an extractor insert and O-ring to support reliable extraction.Product Highlights Black nitride finish for enhanced wear and corrosion resistance Mil-spec configuration designed for AR-15 compatibility Properly heat treated and precision ground for consistent fit and function Extractor insert and O-ring included to support reliable extraction Made in the USASpecs Brand: Midwest Industries Product Type: Bolt Carrier Group (BCG) Platform Compatibility: AR-15 Cartridge: 5.56x45mm NATO Finish: Black Nitride Carrier Type: M16 Specification: Mil-Spec Material: 4140 Chrome Moly Steel Included: Extractor insert; O-ring Country of Origin: United States of America UPC: 812102032946 Manufacturer Part Number: MI-BCG-NITDisclaimer: 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.