Note: The complete upper pictured is for reference only and is not included.
Retro barrel specs are as follows:
10.1″ 4150 chromoly steel, externally coated with 2400 series Bake-On KG GunKote.
Pistol gas port position
.750 gas block journal (under hand guard)
.750 front sight tower journals
Muzzle threaded 5/8-24
Weight .94 pounds