Battle Arms Development WORKHORSE 16-inch Upper Receiver 5.56 NATO

The WORKHORSE complete upper receiver is built around a forged WORKHORSE receiver machined from 7075-T6 aircraft-grade aluminum and a free-float rail handguard with M-LOK attachment points at 3, 6, and 9 o’clock. A full-length Picatinny accessory rail at 12 o’clock features the signature notch cut that matches the upper receiver. Every upper ships with a 4150 chrome-moly steel barrel finished in black nitride and is individually head-spaced with a matching 9310 steel bolt and an 8620 black nitride carrier for reliable operation and straightforward maintenance. This assembly is configured for AR-15 fitment and includes essential accessories to complete an AR upper.

Key Specifications

• Fit is specified for AR-15 platforms.
• Caliber is listed as .223 REM/5.56 NATO.
• The barrel length is 16 inches.
• The receiver is forged from 7075-T6 aircraft-grade aluminum.
• The handguard is a free-float rail with M-LOK attachment points at 3, 6, and 9 o’clock.
• There is a full-length Picatinny accessory rail at 12 o’clock with the signature notch cut.
• The barrel material and finish are 4150 chrome-moly steel, black nitride.
• The bolt is made from 9310 steel and the carrier is 8620 steel, black nitride.
• Color/finish is specified as Black.
• Included accessories are a Bad Rack-15 Charging Handle and an AR15/M16 Bolt Carrier Group.

Built from proven materials and assembled with practical features in mind, the WORKHORSE upper provides a solid foundation for range use, sport shooting, and general-purpose AR-15 configurations. Its combination of a forged 7075-T6 receiver, free-float M-LOK rail, and hardened steel components delivers a dependable, serviceable package ready to outfit your AR platform.

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