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

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

This is a complete AR-15 pistol build kit built around a 10.5-inch 4150 chrome moly barrel with carbine-length gas system and a 7-inch quad-rail handguard. The kit includes a complete upper receiver, bolt carrier group, charging handle, lower parts kit, buffer system, and Magpul BTR pistol brace. Everything you need except the lower receiver.

Key Features

• 10.5-inch nitride-finished 4150 chrome moly barrel with 1:8 twist rate and carbine-length gas system
• 7-inch quad-rail handguard with four-sided Picatinny rail system for accessory mounting
• Complete upper receiver with M4 feed ramps and forward assist
• Bolt carrier group compatible with 5.56 NATO, .223 Remington, .300 Blackout, and .350 Legend
• Mil-spec lower parts kit and carbine buffer system
• Magpul BTR pistol brace for stabilization
• Tanker-style three-port muzzle brake with crush washer
• Made in the USA bolt carrier group and recoil spring

Perfect For

• Shooters building a compact 5.56 NATO platform for home defense or close-quarters training
• Builders wanting a complete upper and lower kit with minimal additional purchases
• Those who prefer quad-rail handguards for maximum accessory flexibility
• Pistol shooters looking to add a rifle-length option without a lower receiver purchase

Carbine-Length Gas System for Compact Profiles

This build uses a carbine-length gas system paired with the 10.5-inch barrel, which is the standard configuration for shorter AR-15 platforms. The A2-style front sight base and gas block work together to cycle the bolt carrier group reliably at this barrel length. The system is tuned for standard 5.56 NATO ammunition without requiring adjustable tuning.

Quad-Rail Handguard and Accessory Mounting

The 7-inch quad-rail handguard provides four continuous Picatinny rails on all sides, allowing you to mount lights, lasers, vertical grips, or other accessories in any configuration you prefer. The rail system is made from 6061-T6 aluminum and maintains mil-spec compatibility with standard AR-15 accessory systems. The delta ring assembly keeps the handguard secured to the barrel.

Complete Kit Includes Everything Except Lower Receiver

This is a full build kit that includes the upper receiver, bolt carrier group, charging handle, lower parts kit, buffer tube, buffer, recoil spring, castle nut, and end plate. The lower receiver is not included and must be purchased separately. Once you have a lower receiver, you'll have all the components needed to assemble a complete rifle.

Magpul BTR Brace for Pistol Configuration

The Magpul BTR pistol brace is a stabilizing brace designed for use with the carbine buffer tube. The brace is adjustable and compatible with standard mil-spec buffer tubes. The brace provides support for one-handed or two-handed shooting while maintaining the pistol configuration of this kit.

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