The Battle Arms Development WORKHORSE complete upper receiver 5.56 NATO 16-inch barrel in black (WH-UR16B-Y-15) is a ready-to-run, mil-spec AR-15 assembly engineered for reliability, accuracy, and modularity in demanding duty, competition, or range environments - featuring a durable 4150 Chrome-Moly Vanadium nitride barrel for enhanced corrosion resistance and longevity with a wide range of ammo, a lightweight M-LOK handguard for accessory freedom, and premium internals like the BAD-RACK-15 ambidextrous charging handle for intuitive manipulation from any angle. This upper drops onto any mil-spec lower in seconds, delivering consistent performance out of the box with its 1:7 twist rate optimized for 55-77 grain projectiles, while the integrated gas block and enhanced BCG ensure smooth cycling and reduced recoil for faster follow-ups.
Features
- 16-inch 4150 Chrome-Moly Vanadium nitride barrel (5.56 NATO, 1:7 twist, mid-length gas system) - built for precision and durability
- 7075-T6 forged aluminum upper receiver with hardcoat black anodized finish
- 15-inch M-LOK compatible handguard - slim profile for comfortable handling and accessory mounting
- Includes BAD-RACK-15 ambidextrous charging handle - patented rack design for left/right/center pulls
- M16 bolt carrier group - full-auto rated with enhanced extractor for reliable feeding
- A2-style flash hider - effective muzzle control without added weight
- Low-profile gas block - tuned .078-inch port for optimal gas flow
- 100% made in the USA with lifetime warranty
