16" .338 ARC AR-15 Rifle Barrel – 1:8 Twist & Pistol Gas

Barrels

AR-15 .338 ARC 16" Rifle Barrel | 1:8 Twist | Pistol Gas | 5/8-24

Build a rifle-length .338 ARC AR-15 around the Moriarti 16" .338 ARC Barrel, featuring a 1:8 twist rate and pistol-length gas system. This configuration combines a full 16-inch barrel with the AR-15-size platform, making it an attractive option for shooters interested in the versatility of .338 ARC in a rifle configuration.

Manufactured from durable 4150V steel, the barrel features a medium profile, .750" gas block journal, and black nitride finish. At approximately 30 oz., it provides a substantial barrel profile while maintaining practical AR-15 dimensions.

The barrel uses a pistol-length gas system, an important specification when selecting the appropriate gas tube and related components. At the muzzle, 5/8-24 threads accommodate appropriately compatible muzzle devices and suppressor mounting systems.

With its 16" length and 1:8 twist, this .338 ARC barrel is positioned as the rifle-length counterpart to Moriarti's shorter .338 ARC barrel configurations. It is well suited to customers looking for a .338 ARC platform for hunting, range use, and compatible supersonic or subsonic ammunition applications.

Specifications

Key Features

• 16" .338 ARC AR-15 rifle barrel
• 1:8 twist rate
• Pistol-length gas system
• .750" gas block journal
• Medium profile
• 5/8-24 threaded muzzle
• 4150V steel construction
• 30 oz. barrel weight
• Black nitride finish
• Rifle-length alternative to shorter .338 ARC configurations

Suppressor Compatibility

The 5/8-24 muzzle thread provides an interface for compatible muzzle devices and mounting systems, but it does not establish universal suppressor compatibility. Always verify the suppressor manufacturer's cartridge, barrel-length, ammunition, and mounting requirements.

Why does this 16" .338 ARC barrel use a pistol-length gas system?

This 16" .338 ARC barrel is manufactured with a pistol-length gas system, so compatible gas components should be selected according to the barrel specification. Gas-system requirements are cartridge- and barrel-design dependent and should not be assumed from barrel length alone. Always follow the barrel and component manufacturers' specifications when matching parts.