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

Atriox 16-inch .22 LR AR-15 Full Build Kit

The Atriox is a Full Build Kit 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, so no gas system is required. A dedicated .22 LR bolt group, Mil-Spec charging handle, complete Lower Parts Kit, carbine buffer-system components, and a SOPMOD-style collapsible stock round out the rest of the rifle. The lower receiver is not included, leaving the buyer to select and supply that component separately.

Key Features

• 16-inch dedicated .22 LR barrel, pencil profile
• Direct blowback operating system, no gas system required
• 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
• Dedicated stainless steel .22 LR bolt group included
• SOPMOD-style collapsible stock with integrated storage compartments and QD sling mounts
• Complete Mil-Spec Lower Parts Kit and carbine buffer-system components included
• Lower receiver is not 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 no gas block, gas tube, or gas port is needed anywhere along the barrel. At the muzzle sits an A2-style GI birdcage flash hider, 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.

Lower Parts Kit and Buffer System

A complete Mil-Spec AR-15 Lower Parts Kit covers the fire-control and lower-control internals needed once a lower receiver is on hand. Behind it sits a Mil-Spec heavy-duty six-position buffer tube, holding a standard AR-15 carbine buffer weighing 3 ounces and a standard USA-made recoil spring. A standard castle nut and Mil-Spec AR-15/M16 receiver end plate secure the buffer tube assembly to the lower.

Stock

Capping off the rifle is a SOPMOD-style collapsible stock finished in black. It includes built-in storage compartments for small parts or batteries, along with integrated QD sling mounts for attaching a sling without extra hardware. It slides onto the six-position buffer tube included with this kit, giving the shooter adjustable length-of-pull for the final piece of the build.

Follow all manufacturer instructions and safe handling practices.

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

Lower receiver is not included.