Davidson Defense Atriox 8.3-inch 1:10 9MM AR-9 Freefloat M-Lok Handguard Pistol Assembled Upper Receiver

Atriox 8.3-Inch 9mm AR-9 Pre-Assembled Upper Receiver with M-Lok Handguard

The Atriox 8.3-Inch 9mm AR-9 Pre-Assembled Upper Receiver is a complete upper assembly ready for installation. The 8.3-inch barrel features nitride finish, medium profile, and 1:10 twist rate. This pre-assembled upper includes a 7075-T6 aluminum upper receiver with M4 feed ramps and anodized finish, 7-inch M-Lok and Picatinny Slant-Pro handguard with built-in QD mounts constructed from 6061-T6 aluminum with anodized black finish, and steel A2-style birdcage flash hider with manganese phosphate finish. The upper assembly arrives fully assembled and ready for BCG and charging handle installation.

Key Features

• Pre-assembled upper receiver, ready for BCG and charging handle installation
• 8.3-inch barrel, nitride finish, medium profile, 1:10 twist rate
• 9mm chambering for AR-9 pistol caliber carbine applications
• 7075-T6 aluminum upper receiver with M4 feed ramps, anodized finish
• 7-inch M-Lok and Picatinny Slant-Pro handguard, 6061-T6 aluminum, anodized black
• Built-in QD mounts, anti-rotation tabs, and oblong cuts for weight reduction
• A2-style birdcage flash hider, steel construction, manganese phosphate finish
• 1/2x28 muzzle thread pitch for standard muzzle devices and suppressors

Perfect For

• Builders seeking pre-assembled 9mm AR-9 upper receivers
• Shooters prioritizing complete upper assemblies with installed handguards
• Users requiring built-in QD mounting points on handguard
• Those needing M-Lok and Picatinny rail compatibility in a pre-assembled configuration

Pre-Assembled Upper Configuration

This upper receiver arrives as a complete pre-assembled unit with barrel, handguard, and muzzle device installed. The assembly is ready for bolt carrier group and charging handle installation to complete the upper. The pre-assembled configuration eliminates the need for barrel installation, handguard mounting, and muzzle device timing, providing a ready-to-install upper assembly for AR-9 builds.

9mm Chambering and Barrel Specifications

The 9mm chambering operates through blowback action. The 8.3-inch barrel features medium profile with nitride finish for corrosion resistance and surface hardness. The 1:10 twist rate provides stabilization for 9mm projectiles. The 1/2x28 thread pitch accommodates standard AR-15 muzzle devices including the pre-installed A2-style birdcage flash hider with steel construction and manganese phosphate finish.

Slant-Pro Handguard with Integrated Features

The 7-inch M-Lok and Picatinny Slant-Pro handguard features 6061-T6 aluminum construction with anodized black finish and provides M-Lok slots for accessory mounting along with Picatinny rail sections. The handguard includes built-in QD sling swivel mounting points, anti-rotation tabs for secure upper receiver attachment, and oblong cuts for weight reduction. The free-float design comes pre-installed on the upper receiver.

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