Davidson Defense Stronghold 16-inch Carbine-Gas 1:8 .338 ARC AR-15 Freefloat M-Lok Handguard Rifle Full Build Kit

16" Davidson Defense Stronghold | Carbine Gas .338 ARC AR-15 Build Kit | Freefloat M-Lok Handguard | 4150 CMV Nitride Barrel | 1:8 Twist

Built for precision shooters and gunsmiths seeking a high-performance .338 ARC platform, this complete rifle build kit delivers accuracy, durability, and modularity in one package. The 16-inch 4150 Chrome Moly Vanadium barrel features a 1:8 twist rate and black nitride finish for corrosion resistance and extended barrel life. The H-Bar profile provides rigidity and heat dissipation during extended shooting sessions, while the carbine-length gas system with micro low-profile gas block ensures reliable cycling. A GI birdcage flash hider manages muzzle flash effectively. The 7075 T6 aluminum upper receiver is anodized and machined with M4 feed ramps for smooth, consistent feeding. The 15-inch M-LOK freefloat handguard offers ample real estate for lights, grips, and other accessories, and includes a full-length Picatinny top rail for optics mounting. This kit includes an AR-15 6.5 Grendel II QPQ nitride complete bolt carrier group and an adjustable carbine stock, providing everything needed for a dependable long-range build.

Key Features

• 16" 4150 CMV barrel with 1:8 twist rate and black nitride finish for accuracy and durability
• Carbine-length gas system with micro low-profile gas block for reliable operation
• 7075 T6 aluminum upper receiver with anodized finish and M4 feed ramps
• 15-inch M-LOK freefloat handguard with full-length Picatinny top rail for optics and accessories
• AR-15 6.5 Grendel II QPQ nitride complete bolt carrier group included
• Adjustable carbine stock for customizable length of pull
• GI birdcage flash hider for muzzle management
• H-Bar barrel profile for heat dissipation and sustained accuracy

Perfect For

• Precision shooters seeking a .338 ARC platform for long-range accuracy
• Gunsmiths and builders looking for a complete, high-quality rifle kit
• Hunters who need a hard-hitting, flat-shooting caliber for medium to large game
• Enthusiasts wanting a versatile, upgradeable AR-15 build with modern performance

High-Performance Barrel Assembly

The 16-inch 4150 Chrome Moly Vanadium barrel is machined to exacting tolerances and finished in black nitride for superior wear resistance and corrosion protection. The 1:8 twist rate stabilizes a wide range of .338 ARC projectiles, making this build adaptable for both hunting and precision shooting. The H-Bar profile adds stiffness and helps manage heat buildup during high-volume shooting, maintaining accuracy as the barrel warms.

Carbine-Length Gas System

The carbine-length gas system is paired with a micro low-profile gas block for a clean, snag-free profile under the freefloat handguard. This configuration provides reliable cycling and smooth recoil characteristics, making the .338 ARC chambering manageable and consistent. The GI birdcage flash hider reduces muzzle flash and protects threads for future upgrades.

Precision Upper Receiver and Freefloat Handguard

The 7075 T6 aluminum upper receiver is precision-machined and features an anodized finish for durability and corrosion resistance. M4 feed ramps ensure smooth, reliable feeding of .338 ARC ammunition. The 15-inch M-LOK freefloat handguard offers a slim, ergonomic profile with ample attachment points for accessories. The full-length Picatinny top rail provides a stable mounting surface for scopes, red dots, or magnified optics, ensuring zero retention and optimal accuracy.

Complete Bolt Carrier Group and Adjustable Stock

This kit includes an AR-15 6.5 Grendel II QPQ nitride complete bolt carrier group, engineered for the larger .338 ARC case head and finished in durable QPQ nitride for enhanced longevity and corrosion resistance. The adjustable carbine stock allows shooters to dial in their length of pull for comfort and control, making this build adaptable to a variety of shooting positions and shooter preferences.

Follow all safe firearm handling practices and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws. Verify compatibility of all components with your chosen caliber and configuration.