AR-15 .400 Legend 18" Rifle Kit – 1:16 Twist & Mlok

Kits

AR-15 .400 Legend 18" Rifle Kit | 1:16 Twist | Mlok | 6.5 Grendel BCG

Built for hunters and shooters looking for a longer-barreled .400 Legend AR-15 rifle configuration, this Moriarti 18" .400 Legend AR-15 rifle kit combines a medium-profile 4150 CrMoV barrel, forged upper receiver, free-float slim MLOK, 6.5 Grendel-pattern M16 bolt carrier group, Mil-Spec lower parts kit, and adjustable M4 LE-style stock system.

The 18" .400 Legend barrel features a 1:16 twist rate, carbine-length gas system, .750" gas block journal, 5/8x24 muzzle threads, and durable black nitride finish.

This kit includes the components listed below for completing a compatible AR-15 configuration. Lower receiver is not included.

Multiple Color Options Available

Customize the appearance of your .400 Legend rifle with available Cerakote color options:

Black | Burnt Bronze | FDE | OD Green | Grey | Blue Titanium

Applicable components are finished in the selected color option.

18" .400 Legend Barrel

At the heart of this kit is an 18" .400 Legend medium-profile barrel manufactured from 4150 CrMoV steel. The longer rifle configuration is well suited to hunters and shooters who prefer additional barrel length while retaining the familiar AR-15 platform.

Barrel Specifications:

• Caliber / Chamber: .400 Legend
• Barrel Length: 18"
• Profile: Medium
• Material: 4150 CrMoV
• Finish: Black Nitride
• Twist Rate: 1:16
• Gas System: Carbine Length
• Gas Block Journal: .750"
• Muzzle Thread: 5/8x24
• Muzzle Device: A2-Style Flash Hider

Free-Float MLOK

The barrel is paired with an aluminum free-float slim mlok handguard, providing plenty of space for accessory-mounting space and modern slick appearance.

The handguard is available in your selected Cerakote color, including Burnt Bronze, FDE, OD Green, Grey, Blue Titanium, and Black.

Forged Slick-Side Upper Receiver

The upper features a precision-machined 7075-T6 forged M4 flat-top receiver with dust cover and forward assist.

• 7075-T6 forged aluminum
• M4 flat-top design
• Ejection port cover
• Optics-ready top rail
• Selected components Cerakoted according to chosen color

6.5 Grendel-Pattern M16 Bolt Carrier Group

This .400 Legend configuration includes a complete 6.5 Grendel-pattern M16-cut bolt carrier group.

• 6.5 Grendel-pattern bolt
• M16-cut carrier
• Chrome-lined carrier
• MPI-tested bolt
• Complete bolt assembly
• Cam pin
• Firing pin
• Firing pin retaining pin

AR-15 Tactical Charging Handle

An AR-15 tactical charging handle is included and Cerakoted to coordinate with the selected color configuration where applicable.

Mil-Spec AR-15 Lower Parts Kit

Includes a DPMS-style Mil-Spec AR-15 lower parts kit containing the listed components for use with a compatible stripped AR-15 lower receiver.

Lower receiver is not included.

M4 LE Adjustable Stock & Buffer System

The rifle kit includes an M4 LE-style 6-position adjustable stock with a complete Mil-Spec buffer system.

Included:

• M4 LE-style adjustable stock
• 6-position Mil-Spec buffer tube
• AR-15 buffer
• Buffer spring
• Required buffer-system components

Kit Highlights

.400 Legend | 18" Barrel | 1:16 Twist | Medium Profile | Carbine-Length Gas | .750" Gas Block Journal | 5/8x24 Threads | Black Nitride | Forged Upper | Free-Float Rail | 6.5 Grendel-Pattern M16 BCG | Mil-Spec Lower Parts Kit | M4 LE Adjustable Stock | Multiple Cerakote Colors

Why choose an 18-inch barrel for a .400 Legend AR-15?

An 18-inch .400 Legend barrel appeals to hunters and shooters who prefer a longer rifle configuration and want to take advantage of additional barrel length compared with a more compact 16" setup. The extra length can provide additional velocity with some ammunition while still keeping the rifle relatively manageable for field use. This Moriarti configuration combines its 18" barrel with a 1:16 twist, medium profile, carbine-length gas system, and 5/8x24 muzzle threads. Actual velocity and ballistic performance depend on the specific ammunition used.

Important Product Information

This .400 Legend AR-15 rifle kit comes unassembled and includes the components shown and listed for the selected configuration.

Lower receiver is not included.

Product images are representative and may not exactly depict the final product. Appearance and individual components may vary according to selected configuration, color, and component availability.