The Battle Arms Development WORKHORSE 16" Complete Upper Receiver is a ready-to-build AR-15 upgrade featuring a 5.56x45mm NATO chambering, a 16" barrel, and a durable black anodized finish that delivers rugged reliability in the field or on the range. This upper is designed for AR-15 enthusiasts seeking a high-performance fit with a modern M-LOK handguard that allows versatile accessory mounting and streamlined handling. It arrives as a complete upper receiver assembly, pairing a precision-aligned AR-15 compatible upper with a dependable Bad Rack-15 ambidextrous charging handle and AR15/M16 bolt carrier group, ensuring smooth operation and quick follow-up shots. The Workhorse profile provides a balance of weight, rigidity, and accuracy, making it suitable for hunting, competition, and general-purpose shooting where a robust platform is essential. With its black anodized finish, this upper blends durability with low-profile aesthetics, while the included components reduce setup time and maximize reliability in demanding conditions. Ideal for builders and shooters who demand a proven upper that integrates seamlessly with existing AR-15 configurations and delivers consistent performance in 556NATO engagements.