This is what 2A Armament says :
2A-Armament is proud to introduce the Aethon billet upper receiver for 2017. With all the same craftsmanship and weight savings that are trademark to 2A-Armament products the Aethon upper incorporates a forward assist to satisfy personal preference. The Aethon upper styling is designed with interchangeability options in mind and matches perfectly to either a Aethon or Balios Lite Lower.
Aethon Upper Features:
CNC Machined from U.S.A. sourced 7075-T6 plate aluminum
Bead blasted and hard coat anodized black (Type III, Class2)
Can be interchanged with third party, Aethon, or Balios Lite Gen 2 lowers
Weight: (Upper 6.8 oz) Stripped
Product of the Great State of Idaho, MADE IN THE U.S.A.
$254.00 Regular Price