18" .400 Legend AR-15 Rifle Barrel – 1:16 Twist

Barrels

AR-15 .400 Legend 18" Barrel | 1:16 Twist | Carbine Gas

Built for a longer .400 Legend AR-15 rifle configuration, this 18" .400 Legend barrel combines a medium profile with durable 4150 CrMoV construction and a black nitride finish.

The barrel features a 1:16 twist rate, carbine-length gas system, .750" gas block journal, and 5/8x24 muzzle threads. Its 18" length makes it particularly attractive for hunting-oriented .400 Legend rifles where shooters prefer additional barrel length over a more compact 16" configuration.

Barrel Specifications

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

Key Features

18" Rifle Barrel — A longer .400 Legend barrel option well suited to hunting-oriented and full-size AR-15 rifle configurations.

1:16 Twist Rate — Manufactured with a 1:16 rifling twist specification for the .400 Legend chambering.

Medium Profile — Provides a practical balance between barrel rigidity and overall weight.

Carbine-Length Gas System — Manufactured with a carbine-length gas system and standard .750" gas block journal.

4150 CrMoV Steel — Manufactured from Chrome Moly Vanadium steel for durability and longevity.

Black Nitride Finish — Provides a durable surface with increased wear and corrosion resistance.

5/8x24 Muzzle Threads — Threaded 5/8x24 for compatible muzzle devices. Always verify thread specification and caliber rating when selecting a muzzle device.

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

An 18-inch .400 Legend barrel is a strong option for hunters and shooters who prioritize a longer rifle configuration over the more compact handling of a 16" barrel. Depending on the ammunition, additional barrel length may also provide some increase in muzzle velocity. This barrel combines its 18" length with a 1:16 twist, medium profile, carbine-length gas system, and 5/8x24 muzzle threads. Actual velocity and ballistic performance vary by ammunition.

Images may not be the exact representation of the product.