Battle Arms Development WH556-URS Workhorse Upper Receiver Aluminum Black Anodized Receiver for AR15/M4

The Battle Arms Development WH556-URS Workhorse Upper Receiver is a precision-engineered aluminum forging purpose-built for AR15 and M4 platform rifles. Designed for shooters who demand reliability without compromise—whether you're running patrol carbines, duty weapons, or precision builds—this upper receiver serves as the foundation for a combat-proven platform. The "Workhorse" designation reflects its role in professional and civilian applications where repeatability and durability are non-negotiable.

Manufactured from 7075-T6 aluminum and hard-coat anodized in tactical black, the WH556-URS upper receiver delivers the dimensional consistency required for tight bolt carrier group fit and reliable feeding cycles. The black anodize finish provides corrosion resistance and reduces reflection in low-light operational environments. At 0.65 lbs, the receiver's weight is consistent with standard AR15/M4 uppers, maintaining your platform's balance and handling characteristics. Battle Arms Development's engineering ensures proper feed ramp geometry and bolt lug engagement surfaces, critical features that separate quality forgings from commodity parts.

This upper receiver is fully compatible with standard AR15 and M4 lower receivers, barrel extensions, and bolt carrier group assemblies in 5.56 NATO/.223 Remington calibers. Law enforcement and military users will recognize the integration with issued components and aftermarket upgrades. Installation requires only a properly headspaced barrel and standard receiver extension—no specialized tooling necessary. Whether you're building a duty rifle, patrol carbine, or precision platform, the Battle Arms Development Workhorse Upper Receiver provides the foundational quality expected by professionals who depend on their equipment under pressure.