Davidson Defense Atriox w/SBA5 Brace 10.5-inch Carbine-Gas 1:7 5.56 NATO AR-15 Freefloat M-Lok Handguard Pistol Full Build Kit

Davidson Defense Atriox AR-15 Pistol Full Build Kit with SB Tactical SBA5 Brace - 10.5-inch 5.56 NATO Carbine-Gas 1:7 Freefloat M-Lok Handguard

The Davidson Defense Atriox with SB Tactical SBA5 Brace is an AR-15 pistol full build kit chambered in 5.56 NATO with a 10.5-inch government profile barrel. The kit includes the upper assembly, bolt carrier group, charging handle, SB Tactical SBA5 pistol stabilizing brace, mil-spec heavy-duty 6-position buffer tube, 3 oz carbine buffer, lower parts kit, and all associated buffer system hardware. The lower receiver is not included.

Key Features

• 10.5-inch 4150 CrMoV steel government profile barrel
• Phosphate barrel finish
• 1:7 twist rate
• 1-in-2x28 thread pitch
• Carbine-length gas system with .750 O.D. phosphate-finished steel micro low-profile gas block
• 7075-T6 aluminum upper receiver with M4 feed ramps, anodized finish
• 10-inch freefloat M-Lok handguard in 6061-T6 aluminum with Cerakote finish, quad rail front end, front and rear QD points, slant front profile, and anti-rotation tabs
• Complete bolt carrier group with 9310 alloy steel bolt and 8620 alloy steel body, nitride finish
• Mil-spec M4 charging handle
• GI birdcage flash hider with manganese phosphate finish, 1-in-2x28 thread pitch
• SB Tactical SBA5 pistol stabilizing brace in nylon reinforced polymer, black
• Mil-spec heavy-duty 6-position buffer tube
• 3 oz carbine buffer

Perfect For

• AR-15 pistol builders sourcing a complete kit around a 10.5-inch 5.56 NATO upper
• Builders completing a stripped mil-spec AR-15 lower receiver
• Shooters running a freefloat M-Lok handguard with Cerakote finish and integrated QD sling points
• Builders adding an SB Tactical SBA5 brace to an AR-15 pistol build

Barrel and Gas System

The 10.5-inch government profile barrel is 4150 CrMoV steel with a phosphate finish and a 1:7 twist rate. The barrel handles the 5.56 NATO chamber and provides the threaded muzzle end for the included GI birdcage flash hider in manganese phosphate finish at a 1-in-2x28 thread pitch. The carbine-length gas system uses a .750 O.D. phosphate-finished steel micro low-profile gas block, which sits beneath the handguard and keeps the forend profile clean and unobstructed.

Upper Receiver and Handguard

The upper receiver is 7075-T6 aluminum with M4 feed ramps and an anodized finish. M4 feed ramps support reliable cartridge feeding from the magazine into the chamber. The 10-inch freefloat M-Lok handguard is 6061-T6 aluminum with a Cerakote finish in black, featuring a quad rail section at the front end, front and rear QD sling attachment points, a slant front profile, and anti-rotation tabs. The M-Lok slots along the handguard body provide additional attachment points for lights, grips, and other accessories. The handguard length matches the 10.5-inch barrel, with the muzzle device providing clearance beyond the handguard.

Bolt Carrier Group and Charging Handle

The included bolt carrier group is a complete AR-15 unit with a 9310 alloy steel bolt and an 8620 alloy steel body, finished in nitride. It is compatible with 5.56 NATO, .223 Remington, .300 Blackout, and .350 Legend configurations. The mil-spec M4 charging handle completes the upper component set.

SB Tactical SBA5 Brace and Buffer System

The SB Tactical SBA5 pistol stabilizing brace is nylon reinforced polymer in black and pairs with the included mil-spec heavy-duty 6-position buffer tube. The 3 oz carbine buffer, lower parts kit, and all associated buffer system hardware cover the core lower completion components outside the serialized lower receiver.

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