The Battle Arms Development WORKHORSE 5.56 NATO upper receiver assembly delivers a no-frills, combat-ready configuration for AR-15 pattern lowers.
- Caliber: 5.56 NATO / .223 Remington
- Type: Complete Upper Assembly (No BCG/Charging Handle)
- Compatible Lower: Mil-spec AR-15 pattern receivers
- Barrel Length: 16 inches
- Material: Forged aluminum receiver
- Finish: Type III hard anodized black
- Includes: Upper receiver, barrel, gas system, muzzle device, handguard
- Installation: Requires BCG and charging handle (sold separately); attaches via standard takedown pins










