MPN: WH-UR-10.5-556


  • Caliber: 5.56 NATO
  • Finish: Type III Class 2 Hardcoat Anodized Finish
  • Upper Receiver: Mil-Spec AR-15 Upper - 7075-T6 Aluminum
  • Handguard: Battle Arms Development 9.5-Inch WORKHORSE Free-Float M-LOK Rail
  • M4 Feed Ramps: Yes
  • Muzzle Device: A2 Flash Hider
  • Barrel: 10.5" 1:7 Nitride Coated 4150 Chrome Moly Vanadium Barrel
  • Muzzle Thread Pattern: 1/2"-28 TPI
  • Gas Block: .750" Low-Profile Gas Block
  • Gas Tube: Carbine-Length Gas tube
  • Bolt Carrier Group: Not Included
  • Charging Handle: Not Included

*This upper assembly does not come with Bolt Carrier Group and Charging Handle


  • Weight: ~2.5 lbs.
  • Overall Length: ~18.95"


  • AR-15 lower receiver


  • 1x Battle Arms Development 10.5-Inch 5.56 WORKHORSE Upper With M-LOK Rail


Short-barreled rifles (SBR) or AR Pistols are excellent self-defense and range weapons. The Battle Arms Development 5.56 WORKHORSE Upper is made with a short 10.5-inch barrel and is a strong option for an SBR or AR pistol.

Built to Last

This upper assembly includes a barrel, modern M-LOK handguard, gas system, and receiver. The barrel is 10.5 inches long and is made from 4150 Chrome Moly Vanadium which is super strong, accurate, heat resistant, and corrosion-resistant as well. The barrel has a 1/2"-28 thread pitch and comes with a standard A2 style flash hider.

Ready for Accessories

This Upper Assembly comes with the Battle Arms Development 9.5-Inch WORKHORSE handguard. This low-profile rail has M-LOK slots on the sides and the bottom, with a full-length Picatinny rail on the top for mounting modern accessories and optics. The low-profile gas block fits nicely inside the handguard, and it uses a carbine-length gas tube, which is ideal for a 10.5-inch barrel.

Lastly, the Mil-Spec upper receiver itself is precision made with 7075-T6 Aluminum. It has a forward assist and port door, all of which have a uniform black finish. The receiver features M4 feed ramps for improved reliability as well.

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  • This Item: Battle Arms Development 10.5-Inch 5.56 WORKHORSE Upper With M-LOK Rail
    MSRP: $529.99
    (You save $30.00 )

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