Davidson Defense ARC Knight 18-inch Rifle-Gas 1:7 22 ARC AR-15 M-Lok Handguard Rifle Full Build Kit

ARC Knight 18-inch .22 ARC AR-15 Full Build Kit

The ARC Knight is a Full Build Kit built around an 18-inch heavy .22 ARC barrel, machined from 416R stainless steel, paired with a 7075-T6 aluminum upper receiver finished in anodizing. It pairs a 15-inch K-style ultra-lightweight minimalist M-LOK handguard with an A2 GI 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 adjustable 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

• 18-inch heavy .22 ARC barrel, 1:7 twist, 416R stainless steel
• Rifle-length gas system with micro low-profile steel gas block
• 7075-T6 aluminum upper receiver, anodized finish
• 15-inch K-style ultra-lightweight minimalist M-LOK handguard
• A2 GI birdcage flash hider, 1/2x28 thread
• 6.5 Grendel II bolt carrier group, QPQ nitride finish
• Special Operations adjustable collapsible stock
• Complete Mil-Spec Lower Parts Kit and carbine buffer-system components included
• Lower receiver is not included.

Barrel and Gas System

The barrel runs 18 inches long, chambered in .22 ARC and machined from 416R stainless steel with a 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 and finished in anodizing, cut with M4 feed ramps for smooth feeding and fitted with an 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 K-style handguard, an ultra-lightweight minimalist design using an M-LOK attachment system along its length. This handguard does not include anti-rotation tabs.

Muzzle Device

Capping the muzzle is an A2 GI birdcage flash hider, threaded to match the barrel's 1/2x28 pattern and 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. 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 adjustable collapsible stock. 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.