Davidson Defense Warden Duty 16-inch Carbine-Gas 1:8 .338 ARC AR-15 Freefloat Keymod Handguard Rifle Full Build Kit

Warden Duty 16 Inch .338 ARC AR-15 Full Build Kit with Trinity Force ECHO Keymod Handguard and SOPMOD Stock

16 inch 4150 CMV steel barrel in .338 ARC with 1:8 twist rate, heavy barrel profile, parkerized finish, carbine length gas system, micro low profile steel gas block, Trinity Force ECHO 15 inch Keymod handguard, 7075-T6 aluminum upper receiver with M4 feed ramps, QPQ nitride finished 9310 steel bolt carrier group with 6.5 Grendel II bolt head, mil-spec M4 charging handle, heavy duty 6-position buffer tube, 3 oz carbine buffer and stainless steel gas tube, SOPMOD style collapsible stock with storage compartments, and GI birdcage flash hider. This full build kit delivers big bore AR-15 performance with the stopping power of .338 caliber projectiles and all major components needed except the lower receiver.

Key Features

• 16 inch .338 ARC barrel made from 4150 CMV steel with heavy barrel profile, parkerized finish, and 1:8 twist rate optimized for .338 caliber projectiles
• Carbine length gas system with stainless steel gas tube provides reliable cycling with the gas volume characteristics of .338 ARC
• Micro low profile steel gas block sits flush under the handguard with minimal height and maintains gas seal integrity under higher pressures
• Trinity Force ECHO 15 inch Keymod handguard made from aluminum allows accessory mounting without affecting barrel harmonics
• 7075-T6 aluminum upper receiver with M4 feed ramps and anodized finish provides reliable feeding and corrosion resistance
• QPQ nitride finished 9310 steel bolt carrier group with 6.5 Grendel II bolt head compatible with .338 ARC cartridge dimensions
• SOPMOD style collapsible stock built from nylon reinforced polymer with integrated storage compartments for batteries, tools, or small parts
• Complete buffer system includes heavy duty 6-position buffer tube, 3 oz carbine buffer, spring, castle nut, and end plate
• 5/8x24 threaded muzzle with GI birdcage flash hider compatible with .308 diameter suppressors and muzzle devices

Perfect For

• Hunters wanting AR-15 platform ergonomics with larger caliber stopping power
• Close to mid range applications where .338 diameter projectiles deliver superior energy transfer
• Shooters exploring big bore AR-15 cartridges beyond standard 5.56 NATO or .300 Blackout
• Builders who value onboard storage for batteries, cleaning tools, or emergency supplies
• Anyone assembling a complete .338 ARC rifle with all major components in one package

.338 ARC Big Bore Performance

The .338 ARC cartridge delivers significantly larger projectile diameter and energy compared to standard AR-15 cartridges while maintaining compatibility with AR-15 magazines and lower receivers. The 1:8 twist rate stabilizes .338 caliber bullets across common hunting and defensive weight ranges. The heavy barrel profile provides additional rigidity and heat dissipation for sustained accuracy, particularly important with the increased pressure and heat generated by larger bore cartridges. The parkerized finish protects against corrosion and wear while providing a non-reflective surface. The 16 inch length balances velocity extraction with maneuverability, keeping overall length reasonable while maximizing the performance potential of .338 ARC.

Carbine Gas System with Steel Components

The carbine length gas system positions the gas port at the standard carbine distance from the chamber, tuned for the gas volume characteristics of .338 ARC in this barrel length. The stainless steel gas tube resists corrosion from combustion byproducts and maintains dimensional stability under heat. The micro low profile steel gas block is constructed from steel rather than aluminum, providing increased durability under the higher pressures and temperatures associated with larger bore cartridges. Steel gas blocks resist erosion and maintain gas seal integrity over extended use. The low profile design sits flush under the handguard without creating a visible hump or adding unnecessary bulk to the front end.

.338 ARC Compatible Bolt Carrier Group

The QPQ nitride finished 9310 steel bolt carrier group includes a 6.5 Grendel II bolt head, which shares the same bolt face diameter required for .338 ARC cartridges. The .338 ARC uses the same case head dimensions as 6.5 Grendel, requiring a larger bolt face than standard 5.56 NATO bolts. The QPQ nitride finish provides superior corrosion resistance and lubricity compared to traditional phosphate or chrome finishes, creating a hardened surface layer that resists wear and reduces friction. This means smoother cycling, easier cleaning, and longer component life. The mil-spec M4 charging handle provides standard ergonomics and reliable operation.

SOPMOD Stock with Storage and Trinity Force Keymod Handguard

The SOPMOD style collapsible stock provides multiple length of pull positions across the heavy duty 6-position buffer tube and includes waterproof storage compartments on both sides for spare batteries, cleaning supplies, or emergency tools. The nylon reinforced polymer construction balances durability with weight savings while maintaining mil-spec carbine buffer tube compatibility. The stock locks securely at each position. The Trinity Force ECHO 15 inch Keymod handguard extends nearly to the muzzle and allows you to attach lights, grips, bipods, and other accessories using Keymod compatible mounts. The freefloat design means the handguard does not contact the barrel, eliminating pressure points that can shift point of impact as the barrel heats.

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