10.5" .400 Legend AR-15 Pistol Barrel – 1:16 Twist

Barrels

Build a compact .400 Legend AR-15 configuration around this 10.5" .400 Legend pistol barrel. Manufactured from durable 4150 CrMoV steel, the barrel features a government profile, 1:16 twist rate, pistol-length gas system, and black nitride finish.

The barrel uses a .750" gas block journal and 5/8x24 muzzle threads, providing clearly defined specifications for matching compatible components to your .400 Legend configuration.

Barrel Specifications

• Caliber / Chamber: .400 Legend
• Barrel Length: 10.5"
• Profile: Government
• Twist Rate: 1:16
• Gas System: Pistol Length
• Gas Block Journal: .750"
• Material: 4150 CrMoV
• Muzzle Thread: 5/8x24
• Finish: Black Nitride

Key Features

10.5" Compact Barrel Length — A short-barrel option for compatible .400 Legend AR-15 configurations.

1:16 Twist Rate — Manufactured with a 1:16 rifling twist specification.

Pistol-Length Gas System — This 10.5" configuration uses a pistol-length gas system with a .750" gas block journal.

4150 CrMoV Construction — Manufactured from 4150 Chrome Moly Vanadium steel.

Black Nitride Finish — Provides a durable, corrosion-resistant exterior finish.

5/8x24 Muzzle Threads — Threaded 5/8x24 for compatible .40-caliber muzzle devices. Always verify the thread specification and device compatibility before installation.

What is the advantage of a 10.5-inch .400 Legend barrel?

A 10.5" .400 Legend barrel provides a significantly more compact configuration than common 16" and 18" rifle barrels. This Moriarti barrel combines its shorter length with a 1:16 twist rate, pistol-length gas system, .750" gas block journal, and 5/8x24 muzzle threads. The best barrel length ultimately depends on the intended firearm configuration and ammunition, and actual ballistic performance will vary by load.

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