Battle Arms Development WORKHORSE 10.5″ Upper | 5.56 NATO

The Battle Arms Development WORKHORSE complete upper is built around a forged 7075-T6 aircraft-grade aluminum receiver and a free-float M-LOK handguard with attachment points at 3, 6, and 9 o’clock. A full-length Picatinny accessory rail sits at 12 o’clock with the signature WORKHORSE notch cut to match the upper receiver. Every upper is fitted with a 4150 chrome-moly steel barrel finished with black nitride and is individually head-spaced to a matching 9310 steel bolt. This upper is configured for AR-15 platforms and is appropriate for range training and competition use.

Product Specifications

• The product type is Upper.
• The model is WORKHORSE.
• The fit is AR-15.
• The caliber is .223 REM / 5.56 NATO.
• The barrel length is 10.5 inches.
• The receiver material is 7075-T6 aircraft-grade aluminum.
• The handguard is a free-float M-LOK rail with a full-length Picatinny top.
• The barrel steel is 4150 chrome-moly steel with black nitride finish.
• The bolt is 9310 steel and the barrel/bolt are individually head-spaced.
• The carrier is 8620 steel with black nitride finish.
• Included accessories are Bad Rack-15 C charging handle and AR15/M16 bolt carrier group.
• The color is Black.
• The subcategory is Complete Upper Receivers.
• The UPC is 810033786129.

Built with forged components and hardened steel internals, this WORKHORSE upper is intended for shooters who prioritize durability and a modular mounting platform. Its compact 10.5-inch barrel and M-LOK handguard make it well suited to controlled-range work and practical competition builds where maneuverability and reliable function are important.