Davidson Defense Atriox w/Gauntlet Arms Brace 6-inch 1:10 9MM AR-9 M-Lok Handguard Pistol Full Build Kit

Atriox w/Gauntlet Arms Brace 6-inch 9mm AR-9 Full Build Kit

The Atriox w/Gauntlet Arms Brace is built around a 6-inch 9mm barrel finished in nitride, paired with a 7075-T6 aluminum upper receiver finished in black anodizing. It pairs a 10-inch free-float M-LOK handguard with a muzzle-mounted fake can at the muzzle. A complete 9mm bolt carrier group, Mil-Spec charging handle, complete Lower Parts Kit, pistol-caliber buffer-system components, and a Gauntlet Arms polymer stabilizing brace round out the rest of the build. The lower receiver is not included, leaving the buyer to select and supply that component separately.

Key Features

• 6-inch 9mm barrel, 1:10 twist, Nitride finish
• 7075-T6 aluminum upper receiver, black anodized finish
• 10-inch free-float M-LOK handguard with front and rear QD points
• Muzzle-mounted fake can
• Complete 9mm bolt carrier group with external extractor, Glock and Colt-pattern magazine compatibility
• Gauntlet Arms polymer stabilizing brace included
• Complete Mil-Spec Lower Parts Kit and pistol-caliber buffer-system components included
• Lower receiver is not included.

Barrel and Muzzle Device

The barrel runs 6 inches long, chambered in 9mm and built from 4150 chrome moly vanadium steel with a nitride finish. It carries a 1:10 twist rate and a 1/2x28 muzzle thread. At the muzzle sits a muzzle-mounted fake can, threaded to match the barrel's 1/2x28 pattern, giving the build a suppressor-style appearance without functioning as one.

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 10-inch free-float M-LOK handguard finished in black, featuring a quad-rail front section, front and rear QD points, a slanted front, and anti-rotation tabs along its length.

Bolt Carrier Group and Charging Handle

The bolt carrier group is a complete 9mm unit machined from 8620 alloy steel with a nitride finish, fitted with an external extractor for reliable case ejection. It's built for Glock and Colt-pattern magazine compatibility, giving the buyer flexibility depending on the lower this build eventually pairs with. 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 heavy-duty AR-15 pistol buffer tube, holding an AR-15 9mm carbine buffer 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.

Stabilizing Brace

Capping off the rear of the build is a Gauntlet Arms polymer stabilizing brace finished in black. It mounts directly to the pistol buffer tube included with this kit, built specifically for pistol-configured AR platforms like this 9mm build.

Follow all manufacturer instructions and safe handling practices.

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

Lower receiver is not included.