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 Rifle-Gas 1:7 22 ARC AR-15 M-Lok Handguard Rifle Full Build Kit

The ARC Knight is a complete 22 ARC build kit that combines a heavy-profile 416R stainless steel barrel with rifle-length gas system tuning, purpose-built for the 22 ARC cartridge. This full build kit includes everything except the lower receiver, delivering a precision rifle platform optimized for mid-range accuracy and velocity.

Key Features

• 18-inch 416R stainless steel barrel with 1:7 twist rate, heavy profile
• Rifle-length gas system with micro low-profile gas block for reliable cycling
• 15-inch M-Lok handguard with K-style profile and ultra-lightweight design
• 6.5 Grendel II pattern bolt carrier group, QPQ nitride finish
• Complete mil-spec lower parts kit, buffer tube, buffer, and recoil spring
• A2 GI birdcage flash hider with crush washer
• Adjustable collapsible Special Operations stock
• 7075-T6 aluminum upper receiver with M4 feed ramps and forward assist

Perfect For

• Precision rifle builders seeking a 22 ARC platform
• Shooters wanting mid-range accuracy with reduced recoil
• Those building a dedicated cartridge rifle without a complete firearm
• Builders who prefer free-float handguard systems

Precision Cartridge Engineering

The 22 ARC is a modern intermediate cartridge designed for efficiency and accuracy. This kit's 1:7 twist rate and heavy barrel profile stabilize 22 ARC ammunition across velocity ranges, delivering consistent ballistics downrange. The rifle-length gas system provides reliable cycling while managing recoil impulse, making follow-up shots controlled and predictable. The 18-inch barrel length balances velocity retention with handling characteristics typical of modern patrol rifles.

416R Stainless Steel Construction

The barrel uses 416R stainless steel, a material chosen for corrosion resistance and durability in demanding conditions. Stainless steel barrels require different maintenance than chrome-moly alternatives but resist rust and oxidation without additional coating. The heavy profile maintains rigidity under sustained fire, supporting accuracy over extended shooting sessions. This material choice supports precision shooting without sacrificing longevity.

Free-Float M-Lok Handguard System

The 15-inch M-Lok handguard isolates the barrel from mounting pressure, allowing the barrel to vibrate freely and return to the same position shot after shot. This free-float design improves accuracy by eliminating variables introduced by handguard contact. M-Lok slots provide modular accessory mounting without adding weight. The K-style profile offers ergonomic hand placement while maintaining a lightweight footprint.

Grendel II Bolt Carrier Pattern

This kit uses a 6.5 Grendel II pattern bolt carrier group, the standard for 22 ARC platforms. The Grendel II bolt pattern supports the 22 ARC cartridge dimensions and maintains reliable feeding and extraction. QPQ nitride finish provides corrosion resistance and extended service life. The bolt carrier group is the operating heart of the rifle and must match the cartridge and barrel specifications.

Complete Rifle System Components

Lower receiver not included. This kit includes the complete upper assembly, bolt carrier group, charging handle, lower parts kit, buffer tube, standard carbine buffer, recoil spring, castle nut, end plate, and adjustable collapsible stock. All components are mil-spec compatible and function as a complete rifle system once assembled to a compatible lower receiver.

Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws. Lower receiver not included.