Davidson Defense Atriox w/SBA3 Brace 10.5-inch Pistol-Gas 1:8 6.5 Grendel AR-15 Freefloat M-Lok Handguard Pistol Full Build Kit

Atriox 10.5-Inch 6.5 Grendel AR-15 Pistol Full Build Kit with SBA3 Brace

This full build kit combines a 10.5-inch Bear Creek 4150 CrMoV barrel with a 10-inch M-Lok freefloat handguard, chambered in 6.5 Grendel. 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 SBA3 adjustable 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 Bear Creek HBAR barrel, 4150 CrMoV steel with phosphate finish, 1:8 twist rate
• 10-inch M-Lok freefloat handguard with quad rail section, 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 bolt head, 8620 alloy steel body
• SB Tactical SBA3 adjustable 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 manganese phosphate GI birdcage flash hider

Perfect For

• Complete 6.5 Grendel pistol builds requiring only a lower receiver
• Shooters prioritizing adjustable stabilizing brace configurations
• Builders seeking Bear Creek HBAR profile barrels with complete component sets
• Configurations demanding M-Lok freefloat handguards with mil-spec buffer systems

6.5 Grendel Chambering

6.5 Grendel offers extended effective range and superior ballistic performance compared to standard 5.56 NATO, making it well suited for precision applications where barrel length constraints apply.

SB Tactical SBA3 Adjustable Brace

The SB Tactical SBA3 adjustable pistol stabilizing brace provides five positions of length adjustment. 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 bolt head and 8620 alloy steel body. The nitride treatment provides corrosion resistance and surface hardness while reducing friction. This BCG is designed specifically for 6.5 Grendel 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.