Battle Arms Development WORKHORSE 16-inch Upper 5.56 NATO

The WORKHORSE complete upper receiver is purpose-built around a forged WORKHORSE 7075-T6 aircraft-grade aluminum receiver and a free-float rail handguard with M-LOK attachment points at the 3, 6, and 9 o'clock positions. A full-length Picatinny accessory rail runs at the 12 o'clock position with Battle Arms Development's signature notch cut matching the upper receiver. The assembly uses a 4150 chrome-moly steel barrel with a black nitride finish, paired with a 9310 steel bolt and an 8620 black nitride carrier for serviceable reliability and straightforward maintenance.

Key Specifications

• The model is WORKHORSE.
• The caliber is .223 Rem / 5.56 NATO.
• The barrel measures 16 inches.
• The receiver is forged 7075-T6 aluminum.
• The handguard is a free-float rail with M-LOK at 3, 6 and 9 o'clock.
• A full-length Picatinny rail is provided at the 12 o'clock position.
• The barrel is 4150 chrome-moly steel with a black nitride finish.
• The bolt is 9310 steel and the carrier is 8620 steel with a black nitride finish.
• Included accessories are a Bad Rack-15 C charging handle and an AR15/M16 bolt carrier group.
• The finish is Black and it fits the AR-15 platform.

This WORKHORSE complete upper pairs durable, serviceable materials with practical accessory interfaces to support a wide range of AR-15 applications. Its combination of a forged 7075-T6 receiver, M-LOK free-float handguard and a nitride-finished 4150 barrel provides a balanced package for users who prioritize consistent hardware and modularity.