Moriarti AR-15 .400 Legend 10.5" Pistol Upper – Nitride 4150 CMV Barrel, M-LOK, A2 Flash Hider

.400 Legend Upper: Specs & Features

The Moriarti AR-15 400 Legend 10.5" Pistol Upper Assembly offers unmatched ballistic power in a compact AR platform. Designed for hunters, tactical users, and range shooters, the 400 Legend delivers more energy than the 350 Legend while offering a flat trajectory in a 10.5" configuration.

The upper features a 4150 CMV steel, nitride-coated barrel with a 1:16 twist rate, a slim 10" M-LOK handguard, and an A2 flash hider. Built on a forged 7075-T6 upper receiver with a flat top rail, this unit is ready for optics and accessories.

Key Features:

• Caliber: 400 Legend

• Barrel: 10.5" Government Profile | 4150 CMV | Nitride | 1:16 Twist

• Thread: 5/8x24

• Gas System: Pistol-Length

• Gas Block: .750 Low-Profile, Steel, Nitride-Coated

• Handguard: 10" Slim Free-Float M-LOK | Aircraft-Grade Aluminum

• Upper Receiver: Forged 7075-T6 | Flat Top | Anodized | Forward Assist & Dust Cover

• Muzzle Device: A2 Flash Hider (Black)

Please Note:

• This is a complete upper assembly ready to mount on virtually any mil-spec lower receiver.
• BCG (Bolt Carrier Group) and Charging Handle are not included but can be added as additional items.
• MLOK Rails may differ in design depending on stock availability, but rest assured, the quality remains the same.
• Images may not be the exact representation of the product.
• Proudly made in USA by Moriarti Armaments

Complete your look with the Moriarti's Builder Set

FAQ

Will this upper fit my AR-15 lower?

Yes. It fits a standard mil-spec AR-15 lower receiver.

What magazines do I need?

Use magazines made for .400 Legend for reliable feeding.

Is .400 Legend legal for deer hunting?

It is a straight-wall cartridge accepted in many straight-wall deer hunting states. Always check your state's current regulations.

What twist rate does it use?

A 1:16 twist, the standard rate for .400 Legend.

Related: .400 Legend uppers · all AR-15 upper assemblies