Davidson Defense Longbow 10.5" 5.56 NATO AR-15 Pistol Build Kit, 7" Quad Rail, w/ Gauntlet Arms Brace

Longbow 10.5" 5.56 NATO AR-15 Pistol Build Kit, 7" Quad Rail, w/ Gauntlet Arms Brace

This is a complete AR-15 pistol build kit designed for shooters who want a compact, maneuverable platform in 5.56 NATO. The kit includes a 10.5" nitride barrel paired with a carbine-length gas system, a 7" quad-rail handguard, and all components needed to assemble a functional pistol except the lower receiver. The Davidson Defense bolt carrier group is USA-made and compatible with 5.56 NATO, .223 Remington, .300 Blackout, and .350 Legend ammunition.

Key Features

• 10.5" 4150 chrome moly nitride barrel with 1:8 twist rate and M4 profile
• Carbine-length stainless steel gas tube optimized for compact barrel length
• 7" quad-rail handguard with four-sided Picatinny mounting for accessories
• Complete USA-made bolt carrier group with nitride finish
• Tanker-style three-port muzzle brake with crush washer
• Mil-spec lower parts kit with complete trigger assembly
• Polymer stabilizing brace for controlled operation
• Heavy-duty pistol buffer tube with carbine recoil buffer and spring

Perfect For

• Shooters building a compact, home-defense oriented AR-15 pistol
• Operators who need a maneuverable platform in confined spaces
• Builders looking for a complete upper and lower parts solution
• Shooters who want quad-rail modularity for optics and accessories

Upper Assembly Overview

This kit pairs a Davidson Defense upper receiver with a 10.5" nitride barrel built from 4150 chrome moly vanadium. The M4 profile barrel uses a 1:8 twist rate suited for 5.56 NATO duty rounds and heavier projectiles. The carbine-length gas tube cycles the bolt carrier efficiently in this compact configuration. The 7" quad-rail handguard is machined from 6061-T6 aluminum and provides full four-sided Picatinny rail coverage for mounting lights, lasers, and other tactical accessories. An A2-style front sight base is integrated, and a standard ejection port door with rod and spring is included.

Complete Lower Components Included

This kit includes all components required to complete a lower receiver assembly. The complete mil-spec lower parts kit contains the trigger assembly, hammer, disconnector, selector, magazine catch, bolt catch, and all required springs and pins. The heavy-duty pistol buffer tube is paired with a standard carbine recoil buffer weighing 3 ounces and a carbine recoil spring. A mil-spec castle nut and receiver end plate secure the buffer system. The polymer stabilizing brace provides controlled operation and is designed for shooters who want a compact, handheld platform.

Davidson Defense Bolt Carrier Group

The included bolt carrier group is manufactured in the USA from 8620 alloy steel with a nitride finish. The carrier is compatible with 5.56 NATO, .223 Remington, .300 Blackout, and .350 Legend ammunition, providing flexibility for different shooting applications. The nitride finish resists corrosion and wear, and the carrier cycles reliably with the carbine-length gas system included in this kit.

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