Davidson Defense Atriox 16-inch Carbine-Gas 1:8 338 ARC AR-15 M-Lok Handguard Rifle Complete Upper Build Kit

Atriox 16-inch Carbine-Gas 1:8 .338 ARC AR-15 M-LOK Complete Upper Build Kit

The Atriox is a .338 ARC AR-15 Complete Upper built around a 16-inch carbine-length gas platform. The kit centers on a 16-inch HBAR profile barrel in 4150 CrMoV steel with a phosphate finish, 1:8 twist rate, and 5/8x24 thread pitch, paired with a GI birdcage flash hider compatible with .308, 7.62x39, and .300 Blackout, and a black 5/8-inch crush washer. A low-profile gas block at 0.750 diameter and a carbine-length stainless steel gas tube are included on the front end. The 7075-T6 aluminum upper receiver carries an anodized finish with M4 feed ramps, a forward assist assembly, and an ejection port door, rod, and spring, paired with a 15-inch freefloat M-LOK handguard in 6061-T6 aluminum. A complete 6.5 Grendel Type II QPQ nitride bolt carrier group in 9310 alloy steel and a Mil-Spec AR-15 M4 charging handle complete the upper component set.

Key Features

• 16-inch HBAR profile barrel, 4150 CrMoV steel, phosphate finish, 1:8 twist, 5/8x24 thread pitch, .338 ARC
• Carbine-length gas system
• Carbine-length stainless steel gas tube
• Low-profile gas block, 0.750
• GI birdcage flash hider, 5/8x24, .308 and 7.62x39 and .300 Blackout compatible, black 5/8-inch crush washer included
• 7075-T6 aluminum upper receiver, anodized, M4 feed ramps, forward assist assembly, ejection port door, rod, and spring
• 15-inch freefloat M-LOK handguard, 6061-T6 aluminum
• Complete 6.5 Grendel Type II QPQ nitride bolt carrier group, 9310 alloy steel
• Mil-Spec AR-15 M4 charging handle

Perfect For

• Builders sourcing a complete .338 ARC AR-15 upper with a 4150 CrMoV HBAR barrel, 6.5 Grendel Type II QPQ nitride BCG, and 15-inch freefloat M-LOK handguard ready to pair with their own lower receiver
• Shooters building a 16-inch .338 ARC carbine-gas platform who want the BCG and charging handle covered in one complete upper with a GI birdcage flash hider and carbine-length stainless gas tube
• AR-15 builders who want a .338 ARC complete upper with a 6.5 Grendel Type II bolt pattern BCG in QPQ nitride and a forward assist upper receiver without sourcing components separately

Barrel and Muzzle Device

The 16-inch HBAR profile barrel is chambered in .338 ARC and constructed from 4150 CrMoV steel with a phosphate finish. The twist rate is 1:8 and the thread pitch is 5/8x24, which matches the included GI birdcage flash hider. The flash hider is compatible with .308, 7.62x39, and .300 Blackout at the 5/8x24 thread pitch. A black 5/8-inch crush washer, a low-profile gas block at 0.750 diameter, and a carbine-length stainless steel gas tube cover the front end gas configuration on this carbine-length platform.

Upper Receiver and Handguard

The 7075-T6 aluminum upper receiver carries an anodized finish with M4 feed ramps, a forward assist assembly, and an ejection port door, rod, and spring. The 15-inch freefloat M-LOK handguard is 6061-T6 aluminum with M-LOK attachment points along the body for accessory mounting. These two components define the exterior structure of the upper assembly on this .338 ARC platform.

Bolt Carrier Group and Charging Handle

The complete 6.5 Grendel Type II QPQ nitride bolt carrier group is 9310 alloy steel and is compatible with the .338 ARC platform due to the shared 6.5 Grendel bolt pattern. A Mil-Spec AR-15 M4 charging handle is included to complete the upper component set.

Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws.