This complete barrel assembly includes a Picatinny rail gas block, barrel nut, gas tube and handguard cap.
.750 at the Journal (Under the gas block)
Barrel: 20" Triple Lapped, Stainless Steel, M-4 Feed Ramps
Rifling Twist: RH 1:8"
Muzzle Device: None
Front Sight Base: A2 Front Sight Assembly with National Match Sight