Davidson Defense Atriox 10.5-inch Pistol-Gas 1:8 .338 ARC AR-15 Freefloat M-Lok Handguard Pistol Complete Upper Build

Atriox 10.5-Inch .338 ARC AR-15 Pistol Complete Upper

This complete upper features a 10.5-inch Bear Creek 4150 CrMoV barrel with a 10-inch M-Lok freefloat handguard, chambered in .338 ARC. The upper includes an anodized 7075-T6 aluminum receiver with M4 feed ramps, micro low-profile gas block, pistol-length gas system, GI birdcage flash hider, mil-spec charging handle, and 6.5 Grendel II QPQ nitride bolt carrier group with 9310 alloy steel construction.

Key Features

• 10.5-inch Bear Creek HBAR barrel, 4150 CrMoV steel with phosphate finish, 1:8 twist rate
• 10-inch M-Lok freefloat handguard with quad rail section, 6061-T6 aluminum, black
• Anodized AR-15 upper receiver with M4 feed ramps, 7075-T6 aluminum
• Pistol-length gas system with stainless gas tube and .750 micro low-profile gas block
• 5/8x24 threaded barrel with GI birdcage flash hider
• AR-15 6.5 Grendel II QPQ nitride bolt carrier group, 9310 alloy steel
• Mil-spec AR-15 charging handle

Perfect For

• Compact .338 ARC builds requiring complete upper assemblies
• Shooters prioritizing M-Lok accessory compatibility with quad rail section
• Builders seeking Bear Creek HBAR profile barrels with complete bolt carrier groups
• Configurations demanding freefloat handguards with included internals

.338 ARC Chambering

.338 ARC delivers substantial energy transfer and extended effective range in a compact platform. The caliber provides stopping power suitable for medium game applications while maintaining compatibility with AR-15 platform dimensions.

QPQ Nitride Bolt Carrier Group

The 6.5 Grendel II bolt carrier group features QPQ nitride finish over 9310 alloy steel. The nitride treatment provides corrosion resistance and surface hardness while reducing friction. This BCG is designed for compatibility with .338 ARC chambering.

M-Lok Freefloat Handguard with Quad Rail

The 10-inch M-Lok freefloat handguard features 6061-T6 aluminum construction with M-Lok slots for modular accessory attachment and an integrated quad rail section for direct Picatinny mounting. The freefloat design isolates the barrel from external pressure, supporting accuracy in compact upper configurations.

Compatibility and Assembly

This complete upper is compatible with standard AR-15 lower receivers. All components use mil-spec dimensions and threading, including the 5/8x24 TPI muzzle threads matching the included GI birdcage flash hider.

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