Davidson Defense Atriox 20-inch Rifle-Gas 1:7 22 ARC AR-15 Freefloat M-Lok Handguard Rifle Full Build Kit

Atriox 20-inch .22 ARC AR-15 Full Build Kit

The Atriox is a Full Build Kit built around a 20-inch heavy .22 ARC barrel, built from 4150 chrome moly vanadium steel with a Parkerized finish, paired with a 7075-T6 aluminum flat-top upper receiver finished in black anodizing. It pairs a Series A 15-inch M-LOK Slant-Pro handguard with an AR-15 GI A2 birdcage flash hider at the muzzle, running on a rifle-length gas system. A 6.5 Grendel II bolt carrier group, Mil-Spec charging handle, complete Lower Parts Kit, carbine buffer-system components, and a Special Operations 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

• 20-inch heavy .22 ARC barrel, 1:7 twist, Parkerized finish
• Rifle-length gas system with micro low-profile steel gas block
• 7075-T6 aluminum flat-top upper receiver, black anodized finish
• Series A M-LOK Slant-Pro 15-inch handguard with front quad rail
• AR-15 GI A2 birdcage flash hider
• 6.5 Grendel II bolt carrier group, QPQ nitride finish
• Special Operations stock, glass-filled polymer
• Complete Mil-Spec Lower Parts Kit and carbine buffer-system components included
• Lower receiver is not included.

Barrel and Gas System

The barrel runs 20 inches long, chambered in .22 ARC and built from 4150 chrome moly vanadium steel with a Parkerized finish and heavy profile. It carries a 1:7 twist rate and a 1/2x28 muzzle thread. Gas cycles back to the action through a rifle-length system, running a stainless steel rifle-length gas tube and a micro low-profile steel gas block sized to a .750-inch journal.

Upper Receiver and Handguard

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

Muzzle Device

Capping the muzzle is an AR-15 GI A2 birdcage flash hider, compatible with the 5.56/.223 thread pattern. It threads onto the barrel's 1/2x28 pattern and is secured with the included 1/2-inch black crush washer.

Bolt Carrier Group and Charging Handle

An AR-15 6.5 Grendel II bolt carrier group is included, finished in QPQ nitride and listed for the 6.5 Grendel II/.22 ARC pattern. 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, and a pistol grip is included as part of the kit. 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. An AR-15 carbine 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 Special Operations stock, molded from glass-filled polymer and finished in black. It's an adjustable design built for a Mil-Spec buffer tube, matching the buffer tube included with this kit, and includes both a QD mount and a sling loop for attaching a sling.

Follow all manufacturer instructions and safe handling practices.

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

Lower receiver is not included.