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

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

The Atriox 8.3-Inch 9mm AR-9 Pre-Assembled Complete Upper is a fully assembled upper receiver ready for installation. The 8.3-inch barrel features nitride finish, medium profile, and 1:10 twist rate. This complete 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, steel A2-style birdcage flash hider with manganese phosphate finish, 9mm nitride bolt carrier group constructed from 8620 alloy steel, and mil-spec M4 charging handle with anodized black aluminum construction. The upper assembly arrives fully assembled and ready for installation.

Key Features

• Pre-assembled complete upper with BCG and charging handle installed
• 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
• 9mm nitride BCG, 8620 alloy steel construction
• Mil-spec M4 charging handle, anodized black aluminum
• Built-in QD mounts, anti-rotation tabs, and oblong cuts for weight reduction
• A2-style birdcage flash hider, 1/2x28 thread pitch

Perfect For

• Builders seeking complete pre-assembled 9mm AR-9 upper receivers
• Shooters prioritizing ready-to-install upper assemblies with BCG and charging handle
• Users requiring built-in QD mounting points on handguard
• Those needing complete upper solutions for AR-9 builds

Pre-Assembled Complete Upper Configuration

This upper receiver arrives as a fully assembled complete unit with barrel, handguard, muzzle device, bolt carrier group, and charging handle installed. The assembly is ready for immediate installation onto a compatible lower receiver. The pre-assembled configuration provides a complete upper solution that eliminates the need for component installation, offering a ready-to-use upper assembly for AR-9 pistol caliber carbine builds.

9mm BCG and Blowback Operation

The 9mm nitride bolt carrier group features 8620 alloy steel construction with nitride finish and is specifically designed for 9mm blowback operation in AR-9 platforms. The BCG operates through blowback action without requiring a gas system, providing reliable cycling with 9mm ammunition. The mil-spec M4 charging handle features anodized black aluminum construction and provides standard AR-15 compatibility.

Barrel and Handguard Specifications

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 7-inch M-Lok and Picatinny Slant-Pro handguard features 6061-T6 aluminum construction with anodized black finish and includes built-in QD sling swivel mounting points, anti-rotation tabs, and oblong cuts for weight reduction. The 1/2x28 thread pitch accommodates standard AR-15 muzzle devices and 9mm suppressors.

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