Davidson Defense Atriox 11.5-inch Carbine-Gas 1:7 5.56 NATO AR-15 Freefloat M-Lok Handguard Pistol Upper Build Kit

Davidson Defense Atriox AR-15 Upper Build Kit - 11.5-inch 5.56 NATO Carbine-Gas 1:7 Freefloat M-Lok Handguard

The Davidson Defense Atriox is an AR-15 upper build kit chambered in 5.56 NATO with an 11.5-inch government profile barrel. The kit includes the upper receiver, barrel, handguard, and GI birdcage flash hider. The 10-inch freefloat M-Lok handguard gives the forend a clean, accessory-ready profile with a Cerakote finish and integrated quad rail front end. A BCG and charging handle are not included.

Key Features

• 11.5-inch 4150 CrMoV steel government profile barrel
• Phosphate barrel finish
• 1:7 twist rate
• 1-in-2x28 thread pitch
• Carbine-length gas system with .750 O.D. phosphate-finished steel micro low-profile gas block
• 7075-T6 aluminum upper receiver with M4 feed ramps, anodized finish
• 10-inch freefloat M-Lok handguard in 6061-T6 aluminum with Cerakote finish, quad rail front end, front and rear QD points, slant front profile, and anti-rotation tabs
• GI birdcage flash hider with manganese phosphate finish, 1-in-2x28 thread pitch

Perfect For

• AR-15 pistol builders sourcing an upper build kit in 5.56 NATO
• Builders pairing an 11.5-inch carbine-gas upper with their own BCG and charging handle
• Shooters running a freefloat M-Lok handguard with Cerakote finish and integrated quad rail
• Builders completing a lightweight AR-15 upper assembly

Barrel and Gas System

The 11.5-inch government profile barrel is 4150 CrMoV steel with a phosphate finish and a 1:7 twist rate. The barrel handles the 5.56 NATO chamber and provides the threaded muzzle end for the included GI birdcage flash hider in manganese phosphate finish at a 1-in-2x28 thread pitch. The carbine-length gas system uses a .750 O.D. phosphate-finished steel micro low-profile gas block, which sits beneath the handguard and keeps the forend profile clean and unobstructed.

Upper Receiver and Handguard

The upper receiver is 7075-T6 aluminum with M4 feed ramps and an anodized finish. M4 feed ramps support reliable cartridge feeding from the magazine into the chamber. The 10-inch freefloat M-Lok handguard is 6061-T6 aluminum with a Cerakote finish in black, featuring a quad rail section at the front end, front and rear QD sling attachment points, a slant front profile, and anti-rotation tabs. The M-Lok slots along the handguard body provide additional attachment points for lights, grips, and other accessories. The handguard length matches the 11.5-inch barrel, with the muzzle device providing clearance beyond the handguard.

Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws. BCG and charging handle are not included.