Davidson Defense Atriox w/SBA5 Brace 10.5-inch Pistol-Gas 1:8 .338 ARC AR-15 Freefloat M-Lok Handguard Pistol Full Build Kit

Atriox 10.5-Inch .338 ARC AR-15 Pistol Full Build Kit with SBA5 Brace

This full build kit combines a 10.5-inch 4150 CrMoV barrel with a 10-inch M-Lok freefloat handguard, chambered in .338 ARC. The kit includes an anodized 7075-T6 aluminum upper receiver with M4 feed ramps, micro low-profile gas block, pistol-length gas system, GI birdcage flash hider, mil-spec charging handle, 6.5 Grendel II QPQ nitride bolt carrier group, SB Tactical SBA5 pistol stabilizing brace, mil-spec heavy-duty 6-position buffer tube, buffer, carbine recoil spring, castle nut, end plate, and lower parts kit. Lower receiver not included.

Key Features

• 10.5-inch HBAR barrel, 4150 CrMoV steel with phosphate finish, 1:8 twist rate
• 10-inch M-Lok freefloat handguard, 6061-T6 aluminum, black
• Anodized AR-15 upper receiver with M4 feed ramps, 7075-T6 aluminum
• Pistol-length gas system with stainless steel gas tube and .750 micro low-profile gas block
• AR-15 6.5 Grendel II QPQ nitride bolt carrier group, 9310 alloy steel
• SB Tactical SBA5 pistol stabilizing brace, black
• Mil-spec heavy-duty 6-position buffer tube with buffer, carbine recoil spring, castle nut, and end plate
• 5/8x24 threaded barrel with GI birdcage flash hider

Perfect For

• Complete .338 ARC pistol builds requiring only a lower receiver
• Shooters prioritizing SB Tactical SBA5 brace configurations
• Builders seeking HBAR profile barrels with complete component sets
• Configurations demanding M-Lok freefloat handguards with mil-spec buffer systems

.338 ARC Chambering

.338 ARC delivers substantial energy transfer and extended effective range in a compact platform. The caliber provides stopping power suitable for medium game applications while maintaining compatibility with AR-15 platform dimensions.

SB Tactical SBA5 Brace

The SB Tactical SBA5 pistol stabilizing brace features adjustable positioning with multiple length options. The brace pairs with the included mil-spec heavy-duty 6-position buffer tube, buffer, carbine recoil spring, castle nut, and end plate.

QPQ Nitride Bolt Carrier Group

The 6.5 Grendel II bolt carrier group features QPQ nitride finish over 9310 alloy steel. The nitride treatment provides corrosion resistance and surface hardness while reducing friction. This BCG is designed for compatibility with .338 ARC chambering.

Compatibility and Assembly

This full build kit is compatible with mil-spec AR-15 lower receivers. All components use standard AR-15 specifications and threading, including the 5/8x24 TPI muzzle threads matching the included GI birdcage flash hider.

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