Battle Arms Development WORKHORSE 10.5in Upper 5.56 NATO

The Battle Arms Development WORKHORSE complete upper is built around a forged 7075-T6 aircraft-grade receiver and a free-float rail with M-LOK attachment points. It ships as a complete upper assembly featuring a 10.5-inch 4150 chrome-moly steel barrel with a black nitride finish, and is head-spaced to match the included bolt and carrier. The WORKHORSE is configured for compact AR-15 builds where a short barrel profile and reliable componentry are priorities for range use, training, and duty-style applications. Controls and accessories are arranged for ambidextrous operation as indicated in the model name.

Key Specifications

• The barrel measures 10.5 inches for a compact, short-barrel profile.
• The caliber is .223 Rem / 5.56 NATO as listed in the product attributes.
• The receiver is a forged 7075-T6 aircraft-grade aluminum WORKHORSE design.
• The handguard is a free-float rail with M-LOK attachment points at 3, 6, and 9 o’clock.
• The top rail features a full-length Picatinny section at 12 o’clock with the WORKHORSE signature notch.
• The barrel material is 4150 chrome-moly steel with a black nitride finish.
• The bolt is made from 9310 steel and the carrier is 8620 steel with black nitride for corrosion resistance.
• Included accessories list a Bad Rack-15 charging handle and an AR15/M16 bolt carrier group.
• The unit is configured to fit AR-15 platforms.
• The exterior finish is Black.

The WORKHORSE upper pairs durable, service-grade materials with a compact configuration suited to short-barrel AR-15 builds. Its combination of a forged 7075-T6 receiver, free-float M-LOK rail, and black nitride 4150 barrel provides a balanced package for range work, training, and compact duty-style applications where reliability and modularity matter.