The Battle Arms Development WORKHORSE Complete Upper Receiver is a precision-engineered solution chambered in 5.56 NATO with a 16" barrel and M-LOK handguard system.Battle Arms Development WORKHORSE Complete Upper Receiver5.56 NATO caliber for reliable performance16" barrel length for optimal accuracy and velocityAR-15 platform compatibilityM-LOK handguard for versatile accessory mountingIncludes BAD Rack-15 C Ambidextrous Charging HandleIncludes AR15/M16 Bolt Carrier Group (BCG)Anodized finish for durability and corrosion resistanceThis complete upper receiver assembly provides everything needed for a reliable AR-15 build featuring quality components and Battle Arms Development's reputation for precision manufacturing.