Davidson Defense Longbow 10.5" 5.56 NATO AR-15 Pistol Build Kit, 7" Quad Rail, 1:8, w/ SBA3 Brace

Longbow 10.5" 5.56 NATO AR-15 Pistol Build Kit, 7" Quad Rail, 1:8, w/ SBA3 Brace

This is a complete 5.56 NATO pistol build kit that gives you everything except the lower receiver. The Longbow comes with a Davidson Defense upper featuring a 10.5-inch nitride barrel, a quad-rail handguard for mounting accessories, a complete bolt carrier group, and an SB Tactical SBA3 brace. The carbine-length gas system keeps the platform reliable and controllable at shorter barrel lengths. You get a mil-spec lower parts kit, buffer tube, buffer, recoil spring, and all the small parts needed to complete the build.

Key Features

• 10.5-inch 4150 chrome moly nitride barrel with 1:8 twist and M4 profile
• 7-inch quad-rail handguard with full Picatinny coverage on all four sides
• Complete USA-made bolt carrier group in 9310 alloy steel with nitride finish
• SB Tactical SBA3 adjustable pistol brace with six-position buffer tube
• Carbine-length gas system with A2-style front sight base
• M4 feed ramps and mil-spec components throughout
• Tanker-style three-port muzzle brake with crush washer installed

Perfect For

• Shooters building a compact 5.56 platform for home defense
• Builders who want a complete upper and lower parts kit solution
• Those seeking a reliable pistol configuration with accessory mounting
• Users who prefer the SBA3 brace for stability and adjustability
• Builders looking for USA-made components in critical areas

Quad-Rail Accessory Platform

The 7-inch quad-rail handguard provides full Picatinny rail coverage on all four sides, giving you unlimited mounting options for optics, lights, lasers, and other tactical accessories. This level of modularity lets you customize the platform exactly how you want it without additional rail adapters or modifications.

Complete Lower Parts Assembly

This kit includes a complete mil-spec lower parts kit with all internal components, a heavy-duty 6-position buffer tube, a standard 3-ounce carbine buffer, and a USA-made carbine recoil spring. The castle nut and end plate are included. Lower receiver not included.

Carbine-Length Gas System Performance

The carbine-length gas tube paired with the 10.5-inch barrel creates a balanced system that cycles reliably while keeping overall length compact. The A2-style front sight base serves double duty as your gas block and front sight post, simplifying the upper assembly.

SBA3 Brace Configuration

The SB Tactical SBA3 brace mounts to the included mil-spec heavy-duty buffer tube and offers six positions of adjustment. This gives you multiple length-of-pull options to fit your shooting style and body type without requiring additional components or modifications.

Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws. Lower receiver not included. BCG and charging handle are included with this complete upper and lower parts kit.