Moriarti AR-15 5.56/.223 18" Red Diamond Tactical Upper Assembly – Triport Muzzle Brake

18" 5.56 Upper: Specs & Features

The Moriarti AR-15 5.56/.223 18" Red Diamond Tactical Upper Assembly combines distinctive red-and-stainless diamond fluting with a precision-oriented, heavy-barrel AR-15 configuration.

Built around an 18-inch 416R stainless steel heavy-contour barrel, this upper features a 1:8 twist rate, red Cerakote finish, and exposed stainless steel diamond fluting. The barrel is hardened to 26–32 HRC and stress-relieved for dimensional stability.

Chambered in 5.56 NATO, the barrel accommodates both 5.56 NATO and .223 Remington ammunition. Its mid-length gas system features a .750-inch gas block journal and matching mid-length gas tube.

The barrel is equipped with a black Triport muzzle brake installed on standard 1/2x28 muzzle threads, complementing the black receiver and handguard while contrasting with the red diamond-fluted barrel.

The assembly features a forged 7075-T6 aluminum A3 flat-top upper receiver with black hardcoat anodized finish, installed forward assist, and dust cover.

A free-floating black M-LOK handguard provides accessory mounting positions and a continuous top Picatinny rail. The streamlined handguard design highlights the exposed stainless steel diamond fluting and red Cerakote barrel finish.

The Moriarti Red Diamond Tactical Series offers a distinctive combination of stainless steel barrel construction, contrasting finishes, and modern AR-15 styling.

Bolt carrier group and charging handle are optional add-ons and are not included unless selected.

Key Features

• 18" heavy-contour 416R stainless steel barrel

• Distinctive diamond-fluted barrel design

• Red Cerakote finish with exposed stainless steel fluting

• 1:8 barrel twist rate

• 5.56 NATO chambering, compatible with .223 Remington

• Heat-treated and stress-relieved barrel

• Mid-length gas system

• .750" gas block journal

• M4 feed ramps

• 1/2x28 muzzle threads

• Black Triport muzzle brake

• Forged 7075-T6 aluminum A3 flat-top upper receiver

• Black hardcoat anodized receiver

• Installed forward assist and dust cover

• Black free-floating M-LOK handguard

• Continuous top Picatinny rail

• Optional bolt carrier group and charging handle

Specifications

Package Includes

• Assembled Moriarti AR-15 5.56/.223 18" Red Diamond Tactical upper

• Installed 18" 416R stainless steel diamond-fluted heavy barrel

• Red Cerakote barrel finish with exposed stainless fluting

• Installed black Triport muzzle brake

• Forged 7075-T6 A3 flat-top upper receiver

• Installed forward assist and dust cover

• Installed black free-floating M-LOK handguard

• Installed mid-length gas system

• Bolt carrier group only when selected

• Charging handle only when selected

Lower receiver, magazine, optics, and ammunition are not included.

FAQ

What barrel does the Red Diamond Tactical upper feature?

An 18-inch heavy-contour 416R stainless steel barrel with diamond fluting, red Cerakote finish, exposed stainless steel flutes, and 1:8 twist rate.

Can this upper use both 5.56 NATO and .223 Remington ammunition?

Yes. The barrel is chambered in 5.56 NATO and accepts both 5.56 NATO and .223 Remington ammunition.

What muzzle device is installed?

A black Triport muzzle brake with 1/2x28 threading.

What gas system does this upper use?

A mid-length gas system with a .750-inch gas block journal.

Does this upper include a bolt carrier group and charging handle?

No. Both components are available as optional add-ons and are included only when selected.

Will this upper fit a standard AR-15 lower receiver?

Yes. It is designed for compatible mil-spec AR-15-pattern lower receivers.

Product Image Notice

Images may not be the exact representation of the product.

Related: 5.56 NATO & .223 Wylde AR-15 uppers