This is what 2A Armament says :



he Balios-lite Gen 2 billet upper and lower receivers were designed with weight savings as the prime objective.  Balios-lite Gen 2 is perfect for those who participate in 3-gun, hunting, or any other shooting activity where weight is a concern. This upper receiver will fit any of our AR15 lowers perfectly (Balios, Balios-lite, Balios-lite Gen 2, or Aethon) and will also fit any standard Mil-spec lower from other vendors. The tapered transition under the charging handle prevents associated wear patterns from damaging the finish. We have eliminated the forward assist, and retained the port door cover.

Balios Lite Gen 2 Upper Features:

    CNC Machined from U.S.A. sourced 7075-T6 plate aluminum
    Pocketed design reduces weight, and enhances appearance
    Bead blasted and hard coat anodized black (Type III, Class2)
    Can be interchanged with third party, Balios Lite, or Aethon lowers
    Weight: ( 5.8 oz ) Stripped
    Product of the Great State of Idaho, MADE IN THE U.S.A.
    SKU (2A-MCBU-4)

Balios Lite Gen 2 Upper Receiver

$254.00 Regular Price
$241.30Sale Price