Product DescriptionThe Fightlite Industries MCR556DFRS is a 5.56x45mm NATO upper receiver assembly built to interface with AR-15/M16/M4-type lowers, delivering a mission-configurable platform with a MIL-STD 1913 rail handguard for optics and accessory mounting. Featuring a 12.5-inch barrel with a 1:7 twist rate and a 1/2"x28 thread pattern, this upper is designed for adaptable performance and fast handling. The upper receiver is precision-machined from 7075-T6 aluminum and incorporates dry film lubrication on critical high-friction surfaces for enhanced function in demanding conditions.Product Highlights 5.56x45mm NATO upper receiver assembly designed for AR-15/M16/M4-type compatibility (per distributor listing) 12.5-inch barrel with 1:7 twist for common 5.56 NATO projectile weights MIL-STD 1913 rail handguard provides versatile mounting for optics, lights, and accessories 7075-T6 aluminum construction for a strong, lightweight upper receiver platform Dry film lubrication applied to critical high-friction surfaces for added performance in extreme conditions (per distributor listing)Specs Brand: FIGHTLITE INDUSTRIES Manufacturer Part Number: MCR556DFRS UPC: 850017078017 Caliber: 5.56x45mm NATO Barrel Length: 12.50 in Twist Rate: 1:7 Thread Pattern: 1/2"x28 Receiver Material: 7075-T6 Aluminum Handguard: MIL-STD 1913 Rail Color: Black (per retailer listing) Sights: Adjustable (per retailer listing) Country of Manufacture: Made in USA (per distributor listing)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.