Davidson Defense Atriox 18-inch Rifle-Gas 1:7.5 6MM ARC AR-15 Freefloat M-Lok Handguard Rifle Complete Upper Build

Davidson Defense Atriox AR-15 Complete Upper - 18-inch 6mm ARC Rifle-Gas 1:7.5 Freefloat M-Lok Handguard

The Davidson Defense Atriox is an AR-15 complete upper chambered in 6mm ARC with an 18-inch government profile barrel. The complete upper includes the upper receiver, barrel, handguard, bolt carrier group, and charging handle. A bolt carrier group and charging handle are included.

Key Features

• 18-inch 4150 CrMoV steel government profile barrel
• Nitride barrel finish
• 1:7.5 twist rate
• 5-in-8x24 thread pitch
• Rifle-length gas system with .750 O.D. gas block
• 7075-T6 aluminum upper receiver, anodized finish
• 17-inch freefloat M-Lok handguard in 6061-T6 aluminum
• 6.5 Grendel II pattern bolt carrier group in 8620 alloy steel, nitride finish
• AR-15 M4 charging handle
• GI birdcage flash hider, 5-in-8x24 thread pitch

Perfect For

• AR-15 rifle builders sourcing a complete upper in 6mm ARC
• Builders pairing an 18-inch rifle-gas upper with a stripped lower receiver
• Shooters running a full-length freefloat M-Lok handguard configuration in 6mm ARC
• Builders looking for a complete upper with bolt carrier group included

Barrel and Gas System

The 18-inch government profile barrel is 4150 CrMoV steel with a nitride finish and a 1:7.5 twist rate optimized for the 6mm ARC caliber. The muzzle is threaded at 5-in-8x24 and pairs with the included GI birdcage flash hider. The rifle-length gas system uses a .750 O.D. gas block positioned beneath the handguard, keeping the forend profile clean and unobstructed across the full handguard length.

Upper Receiver and Handguard

The upper receiver is 7075-T6 aluminum with an anodized finish. The 17-inch freefloat M-Lok handguard is 6061-T6 aluminum in black, providing a full-length clean forend with M-Lok accessory slots for bipods, lights, grips, and other attachments. The handguard extends beyond the 18-inch barrel length, with the muzzle device providing the necessary clearance past the handguard.

Bolt Carrier Group and Charging Handle

The included bolt carrier group is a complete 6.5 Grendel II pattern unit built from 8620 alloy steel with a nitride finish. The 6mm ARC cartridge headspaces on the 6.5 Grendel II bolt pattern, making this the correct bolt carrier group for this configuration. The AR-15 M4 charging handle completes the upper component set.

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