Davidson Defense Longbow 10.5" 5.56 NATO AR-15 Pistol Build Kit, 7" Quad Rail, 1:8, w/ SBA5 Brace

Longbow 10.5" 5.56 NATO AR-15 Pistol Build Kit, 7" Quad Rail, 1:8, w/ SBA5 Brace

This complete AR-15 pistol build kit delivers all the components you need to assemble a reliable 5.56 NATO pistol except the lower receiver. The 10.5-inch nitride 4150 chrome moly barrel pairs with a carbine-length gas system for consistent cycling, while the 7-inch quad-rail handguard provides mounting flexibility. You get a complete bolt carrier group, charging handle, mil-spec lower parts kit, buffer system, and SB Tactical SBA5 stabilizing brace. Every component is mil-spec or better, designed to work together without compatibility headaches.

Key Features

• 10.5-inch nitride 4150 chrome moly barrel with 1:8 twist rate and M4 profile
• 7-inch four-sided Picatinny quad-rail handguard for optics and accessory mounting
• Complete bolt carrier group, charging handle, and lower parts kit included
• SB Tactical SBA5 stabilizing brace with six-position adjustable carbine buffer tube
• A2-style front sight base with tanker-style three-port muzzle brake
• Mil-spec anodized upper receiver and carbine-length gas system

Perfect For

• First-time AR-15 pistol builders looking for a complete kit
• Shooters wanting a compact, maneuverable platform in 5.56 NATO
• Those seeking reliable mil-spec components without assembly complexity
• Builders who prefer quad-rail systems for accessory customization

Design and Component Integration

This Longbow kit combines proven Davidson Defense quality with purpose-built pistol ergonomics. The 10.5-inch barrel balances velocity and maneuverability, while the carbine-length gas system ensures reliable operation across standard 5.56 and .223 ammunition. The quad-rail handguard eliminates drop-in hassles, giving you immediate mounting options for lights, lasers, or other accessories. Every component arrives ready to install on a stripped lower receiver.

Upper Assembly Compatibility

The upper assembly pairs with any mil-spec AR-15 lower receiver. The SBA5 brace fits standard mil-spec carbine buffer tubes, and all components follow mil-spec dimensions for seamless integration. The A2 front sight base and carbine gas tube ensure proper cycling with standard 5.56 NATO loads. If you're building with a different lower, verify that it accepts mil-spec buffer tubes and lower parts kits.

Barrel and Gas System Details

The 4150 chrome moly barrel with nitride finish resists corrosion and handles high round counts. The 1:8 twist stabilizes heavier projectiles while remaining versatile across standard 55-grain to 77-grain loads. Carbine-length gas tuning keeps the bolt carrier group cycling smoothly without excessive wear, and the tanker-style muzzle brake helps manage recoil in this compact format.

What You Need to Know

This kit does not include a lower receiver. You'll need to source a stripped AR-15 lower separately, and assembly requires basic gunsmithing knowledge or professional help. The SBA5 brace is designed for pistol use and comes installed on the carbine buffer tube. All components are USA-made or mil-spec equivalent, reducing compatibility concerns. The quad-rail system is permanent, so accessory mounting is fixed to the handguard itself.

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