This LODO Upper Assembly is chambered in 5.56x45 and comes ready to fire right out of the box upon installation onto any standard AR-15 lower receiver. Our LODO upper receiver group is assembled from premium components into a high performance-package.The upper assembly comes equipped with a 4150 chrome moly steel barrel, 1 in 8″ twist rifling.Pictured with a 12" Hera KeyMod Rail

16" -5.56 Hera IRS Rail

  • Upper Receiver: A3 Flat-Top, Forged 7075-T6 Aluminum

    Barrel Length: 16″

    Barrel Contour: SOCOM

    Barrel Material: 4150 Chrome Moly Steel

    Muzzle Thread Pattern: 1/2 x 28

    Chrome Lined: No

    Barrel Finish: Parkerized

    Twist Rate: 1 in 8″

    Chamber: 5.56

    M4 Feed Ramps: Yes

    Muzzle Device: A2

    Gas System Length: Carbine

    Gas Block Diameter: 0.750″

    Handguard: Hera Arms IRS Rail, 12″ Free Float

    Bolt Carrier Assembly Included: No

    Charging Handle: No

    Weight: 3 lbs.