Davidson Defense Atriox 16-inch .22 LR AR-15 Freefloat M-Lok Handguard Rifle Complete Upper Build

Atriox 16-inch .22 LR AR-15 Complete Upper

The Atriox is built around a 16-inch dedicated .22 LR barrel with a pencil profile, paired with a 7075-T6 aluminum upper receiver finished in black anodizing. It pairs a 15-inch Series A M-LOK Slant-Pro handguard with an A2-style GI birdcage flash hider at the muzzle. It runs on a direct blowback operating system rather than a gas-driven cycle. A dedicated .22 LR bolt group and Mil-Spec charging handle round out the upper, giving the buyer everything needed on the upper side.

Key Features

• 16-inch dedicated .22 LR barrel, pencil profile
• Direct blowback operating system
• 7075-T6 aluminum upper receiver, black anodized finish
• Series A M-LOK Slant-Pro 15-inch handguard with quad-rail front section
• A2-style GI birdcage flash hider, .22 LR bore clearance
• Dedicated stainless steel .22 LR bolt group included
• Mil-Spec AR-15 M4 charging handle included

Barrel and Muzzle Device

The barrel runs 16 inches long, built specifically for .22 LR in a pencil profile rather than a heavier contour. It carries a 1/2x28 muzzle thread and operates on direct blowback, so there's no gas system involved. At the muzzle sits an A2-style GI birdcage flash hider sized with bore clearance for .22 LR, .223, and 5.56, threaded to match the barrel's 1/2x28 pattern and secured with the included 1/2-inch black crush washer.

Upper Receiver and Handguard

The upper receiver is machined from 7075-T6 aluminum and finished in black anodizing, cut with M4 feed ramps for smooth feeding and fitted with a standard AR-15 forward assist assembly. The ejection port carries a standard .223/5.56 door with its rod and spring installed. Over the barrel sits a 15-inch Series A M-LOK Slant-Pro handguard finished in black, featuring a quad-rail front section, a flat-top Picatinny rail, built-in QD mounts, anti-rotation tabs, and oblong ventilation cuts along its length.

Bolt Group and Charging Handle

The bolt group is a dedicated .22 LR unit machined from stainless steel, built specifically for this rimfire chambering rather than shared with centerfire calibers. A Mil-Spec AR-15 M4 charging handle rounds out the upper's operating components.

Follow all manufacturer instructions and safe handling practices.

Ensure compliance with all applicable federal, state, and local laws.