Davidson Defense Attuned w/Gauntlet Arms Brace 10.5-inch Carbine-Gas 1:7 5.56 NATO AR-15 Freefloat Quad-Rail Handguard Pistol Full Build Kit

Attuned 10.5-Inch 5.56 NATO AR-15 Full Build Kit with Gauntlet Arms Brace and Quad-Rail Handguard

The Attuned 10.5-Inch 5.56 NATO AR-15 Full Build Kit includes an upper assembly, bolt carrier group, charging handle, buffer tube, buffer, recoil spring, castle nut, end plate, lower parts kit, and Gauntlet Arms polymer stabilizing brace. The 10.5-inch barrel features 4150 CrMoV construction with phosphate finish, government profile, and 1:7 twist rate. The upper assembly includes a 7075-T6 aluminum upper receiver with M4 feed ramps and anodized finish, 10-inch free-float quad-rail handguard constructed from 6061-T6 aluminum, micro low-profile gas block, and A2-style birdcage flash hider. The nitride-finished BCG is constructed from 9310 alloy steel. Lower receiver not included.

Key Features

• 10.5-inch barrel, 4150 CrMoV steel, phosphate finish, 1:7 twist rate
• Government profile barrel with carbine-length gas system
• 7075-T6 aluminum upper receiver with M4 feed ramps, anodized finish
• 10-inch free-float quad-rail handguard, 6061-T6 aluminum construction
• Gauntlet Arms polymer stabilizing brace included
• Nitride-finished BCG, 9310 alloy steel construction
• Heavy-duty pistol buffer tube with standard carbine buffer
• Mil-spec lower parts kit included
• A2-style birdcage flash hider, 1/2x28 thread pitch

Perfect For

• Builders assembling complete AR-15 pistol configurations without a lower receiver
• Shooters seeking full build kits with Gauntlet Arms brace included
• Users prioritizing quad-rail Picatinny accessory mounting
• Those requiring all components except the lower receiver for a complete build

Carbine Gas System Configuration

The 10.5-inch barrel pairs with a carbine-length gas system, providing increased gas port dwell time compared to pistol-length systems at this barrel length. The micro low-profile steel gas block measures 0.750 inches in diameter and sits beneath the quad-rail handguard. The carbine gas system length offers compatibility with standard carbine-length gas tubes.

Free-Float Quad-Rail Handguard

The 10-inch free-float quad-rail handguard features 6061-T6 aluminum construction and provides four full-length Picatinny rail surfaces for accessory mounting. The handguard extends to near-muzzle length on the 10.5-inch barrel configuration and offers free-float mounting to the upper receiver. The quad-rail design accepts standard Picatinny-compatible accessories including lights, lasers, grips, and rail covers.

Gauntlet Arms Brace and Complete Components

The Gauntlet Arms polymer stabilizing brace mounts to the included heavy-duty pistol buffer tube designed for AR-15 and AR-style pistols. The full build kit includes all components necessary for a complete AR-15 pistol except the lower receiver, including upper assembly, BCG, charging handle, buffer system with 3-ounce standard carbine buffer and recoil spring, mil-spec lower parts kit, and Gauntlet Arms brace. The 9310 alloy steel BCG includes nitride finish and provides compatibility with 5.56 NATO, .223, .300 Blackout, and .350 Legend.

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