MPN: 2A-BCU556ML7BLK-2 / 2A-BCU556ML10BLK-2 / 2A-BCU556ML12BLK-2 / 2A-BCU556ML15BLK-2


  • Caliber: 5.56 NATO
  • Finish: Type III Class 2 Hardcoat Anodized Finish
  • Upper Receiver: 2A Balios Lite Gen 2 Upper Receiver
  • Handguard: 2A Armament BL G2-RAIL, M-LOK, Aluminum Barrel Nut
  • M4 Feed Ramps: Yes
  • Muzzle Device: 2A Armament 5.56 Titanium T3 Compensator
  • Barrel:
    • 7.5 / 10.5 / 12.5-Inch: Ballistic Advantage Modern Series 1:7 Twist 4150 CrMoV Barrel
    • 16-Inch: 2A Armament Lightweight 1:8 Twist 416-R Stainless Steel Barrel
  • Muzzle Thread Pattern: 1/2"-28 TPI
  • Gas Block:
    • 7.5 / 10.5 / 12.5-Inch: 2A Armament .750" Titanium Gas Block
    • 16-Inch: 2A Armament .625" Titanium Gas Block
  • Gas Tube:
    • 7.5-Inch Barrel: Pistol-Length Stainless Steel Gas Tube
    • 10.5-Inch Barrel: Carbine-Length Stainless Steel Gas Tube
    • 12.5-Inch Barrel: Carbine-Length Stainless Steel Gas Tube
    • 16-Inch Barrel: Mid-Length Stainless Steel Gas Tube
  • Bolt Carrier Group: 2A Armament AR-15 Lightweight Bolt Carrier Group
  • Charging Handle: Strike Industries Charging Handle with Extended Latch
  • Each upper is hand assembled and tested to order, available in a variety of lengths for different preferences
  • Made in the USA

*A barrel that is shorter than 16" is only for use on a pistol configuration firearm or a NFA registered Short-Barreled Rifle (SBR). All NFA laws apply!


  • Weight:
    • 7.5-Inch Barrel Version: ~2.57 lb.
    • 10.5-Inch Barrel Version: ~2.83 lb.
    • 12.5-Inch Barrel Version: ~3.02 lb.
    • 16-Inch Barrel Version: ~3.04 lb.
  • Length: 24.78"


  • AR-15 lower receivers


  • 1x 2A Armament Balios-Lite Gen 2 M-LOK Complete Upper Receiver Assembly


The 2A Balios Lite complete upper is an ideal upgrade to your existing rifle or a good choice for use in the specific vision that you have for a custom build.

The 2A Balios Lite Complete Upper Gives Shooters Customization Without Sacrifice

To help you achieve the exact shooting experience that you want, the 2A Armament Balios Lite complete upper is available in several barrel lengths to include 7.5 inches, 10.5 inches, 12.5 inches, and 16 inches. Further, 2A Armament does not make you sacrifice features that you want based upon your barrel length preference; all Balios Lite complete uppers comes with the same high-quality parts, such as the 2A Armament Lightweight Bolt Group and Titanium T3 Compensator.

The 2A Armament Balios Lite Complete Upper is Manufactured in The USA With Excellent Quality Control Measures

The skilled craftsman at 2A Armament hand assembles and tests every upper to ensure quality control. Purchase this complete upper receiver with pride, knowing that it was manufactured in the United States, specifically in Idaho.

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