Davidson Defense Atriox 11.5-inch Carbine-Gas 1:7 5.56 NATO AR-15 Freefloat M-Lok Handguard Pistol Full Build Kit, SBR Ready

Davidson Defense Atriox AR-15 Pistol Full Build Kit SBR Ready - 11.5-inch 5.56 NATO Carbine-Gas 1:7 Freefloat M-Lok Handguard

The Davidson Defense Atriox is an AR-15 pistol full build kit chambered in 5.56 NATO with an 11.5-inch government profile barrel, offered in an SBR Ready configuration. The kit includes the upper assembly, bolt carrier group, charging handle, mil-spec heavy-duty 6-position aluminum buffer tube, 3 oz carbine buffer, carbine recoil spring, mil-spec receiver end plate, lower parts kit, and all associated buffer system hardware. This kit ships without a brace. The lower receiver is not included.

Key Features

• 11.5-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
• Freefloat M-Lok handguard in 6061-T6 aluminum
• Complete bolt carrier group in 9310 alloy steel, nitride finish
• Mil-spec M4 charging handle
• GI birdcage flash hider with manganese phosphate finish, 1-in-2x28 thread pitch
• Mil-spec heavy-duty 6-position aluminum buffer tube
• 3 oz carbine buffer with aluminum body and internal steel weights
• Carbine recoil spring and mil-spec receiver end plate
• SBR Ready configuration

Perfect For

• AR-15 pistol builders sourcing a complete SBR Ready kit around an 11.5-inch 5.56 NATO upper
• Builders completing a stripped mil-spec AR-15 lower receiver
• Shooters selecting their own brace or stock configuration
• Builders running a freefloat M-Lok handguard on an AR-15 pistol build

Barrel and Gas System

The 11.5-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 freefloat M-Lok handguard is 6061-T6 aluminum in black, giving the build a clean forend with M-Lok accessory slots for lights, grips, and other attachments. The handguard length matches the 11.5-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 built from 9310 alloy steel with a nitride finish. 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.

SBR Ready Configuration

This kit ships without a brace and is intended for builders selecting their own final rear end configuration. The mil-spec heavy-duty 6-position aluminum buffer tube, 3 oz carbine buffer with aluminum body and internal steel weights, carbine recoil spring, mil-spec receiver end plate, and lower parts kit are all included to support the lower completion build. The SBR Ready designation means the brace selection is left to the builder, allowing for a custom setup based on individual configuration requirements.

Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws. Lower receiver not included. Ships without a brace. Do not install a stock unless compliant with applicable laws.