MORIARTI AR-15 16" 5.56 NATO Diamond Cut Upper – 12" MLOK, 1:7 Twist, Triport Muzzle

The MORIARTI AR-15 5.56 NATO 16" Diamond Cut MLOK Upper Assembly is a precision-engineered upgrade for any AR-15 build. Designed for performance, reliability, and standout aesthetics, this upper is built around a 4150 chrome moly steel barrel and a mid-length gas system—a perfect balance for smooth recoil and optimal cycling.

The 16" barrel is chambered in 5.56x45mm NATO and features a 1:7 twist, making it ideal for stabilizing heavier projectiles (62–77 grain). The barrel is threaded 1/2x28 and topped with a Triport muzzle device, which reduces recoil and muzzle rise while adding a sleek tactical finish.

The 12" MLOK free-float handguard features diamond-cut slots for weight savings and improved grip. Machined from aircraft-grade 7075-T6 aluminum, both the handguard and receiver are finished with a hard coat anodized black finish for durability in harsh conditions.

This upper uses a .750" gas block journal, a mid-length stainless steel gas tube, and ships fully assembled and test-fired.

Bolt Carrier Group (BCG) and Charging Handle are NOT included.

All Moriarti upper assemblies are proudly manufactured and test-fired in the USA.

Key Specs:

• Caliber: 5.56 NATO

• Barrel Length: 16"

• Barrel Material: 4150 Chrome Moly Steel

• Twist Rate: 1:7

• Gas System: Mid-Length

• Gas Block Diameter: .750"

• Muzzle Thread: 1/2x28

• Muzzle Device: Triport, Black Anodized

• Upper Receiver: 7075-T6 Forged Aluminum, Hardcoat Anodized

• Handguard: 12" Free-Float MLOK, Diamond Cut Slots

• Color: Black

• OAL (Overall Length): 27.5"

• Compatibility: Fits Mil-Spec AR-15 lowers

Pair this upper with the Moriarti AR-15 Lower Receiver to complete your build.