Battle Arms Development WORKHORSE 10.5in Upper 5.56 Black

The Battle Arms Development WORKHORSE complete upper receiver is built for AR-15 platforms and configured for .223 Rem/5.56 NATO. It combines a forged 7075-T6 aircraft-grade aluminum receiver with a free-float M-LOK handguard and a full-length Picatinny rail. The 10.5-inch 4150 chrome-moly black nitride barrel is individually head-spaced to a matching 9310 steel bolt and an 8620 steel carrier for consistent operation.

Key Specifications

• Chambered for .223 Rem/5.56 NATO.
• The barrel measures 10.5 inches.
• The receiver is forged from 7075-T6 aircraft-grade aluminum.
• Handguard is a free-float rail with M-LOK attachment points at 3, 6, and 9 o'clock.
• Top rail features a full-length Picatinny accessory rail with signature notch.
• The barrel is 4150 chrome-moly steel with a black nitride finish.
• The bolt is a 9310 steel component head-spaced to the barrel.
• The carrier is an 8620 steel carrier with black nitride finish.
• Includes a Bad Rack-15 C charging handle and AR15/M16 bolt carrier group.
• Specifically fit for the AR-15 platform.

Engineered for reliable function and modularity, the WORKHORSE 10.5in upper provides a compact, robust foundation for an AR-15 build or upgrade. The combination of a forged 7075-T6 receiver, corrosion-resistant nitride-treated barrel and hardened steel components yields a durable platform suitable for users who prioritize solid construction, straightforward maintenance, and adaptable accessory options.