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

ARC Knight 18-inch .22 ARC AR-15 Complete Upper

The ARC Knight is 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 and Mil-Spec charging handle round out the upper, giving the buyer everything needed on the upper side.

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
• Mil-Spec AR-15 M4 charging handle 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 standard, non-ambidextrous 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.