Davidson Defense Line Drawn 10.5-inch Carbine-Gas 1:8 5.56 NATO AR-15 FSB Carbine-Length Quad-Rail Handguard Pistol Complete Upper Build

Davidson Defense Line Drawn 10.5-Inch Carbine-Gas 1-8 5.56 NATO AR-15 Complete Upper with FSB and Quad-Rail Handguard

The Davidson Defense Line Drawn 10.5-inch Carbine-Gas complete upper is specifically crafted for the AR-15 platform, chambered in 5.56 NATO. Featuring a 1-8 twist rate, this upper ensures precision accuracy across a wide range of bullet weights. The 10.5-inch M4 profile barrel is made from durable 4150 Chrome Moly Vanadium steel with nitride finish, promoting longevity and resilience. The carbine-length gas system with front sight base guarantees reliable cycling and performance. The upper includes a 7075-T6 anodized aluminum A2 upper receiver paired with a black quad-rail handguard crafted from 6061-T6 aluminum, providing ample space for accessory mounting. Completing the setup is a GI birdcage flash hider with 1/2x28 threading and mil-spec AR-15 M4 charging handle. With the integrated 8620 alloy steel bolt carrier group with nitride finish, this complete upper is ideal for gunsmiths who value functionality and versatility in their firearms.

Key Features

• 10.5-inch 5.56 NATO barrel made from 4150 Chrome Moly Vanadium with nitride finish
• M4 profile barrel with 1-8 twist rate for wide bullet weight compatibility
• Carbine-length gas system with front sight base
• 7075-T6 anodized aluminum A2 upper receiver
• 6061-T6 aluminum quad-rail handguard in black
• 8620 alloy steel bolt carrier group with nitride finish
• Multi-caliber BCG compatible with 5.56, .223, .300, and .350
• Mil-spec AR-15 M4 charging handle
• GI birdcage flash hider with 1/2x28 thread pitch
• Complete upper ready for installation

Perfect For

• AR-15 pistol builders seeking compact carbine-gas uppers with front sight base
• Gunsmiths who value functionality and versatility with quad-rail systems
• Shooters requiring ample accessory mounting space on all four sides
• Builders prioritizing complete uppers with included BCG and charging handle

10.5-Inch M4 Profile Barrel with Nitride Finish

The 10.5-inch M4 profile barrel is made from durable 4150 Chrome Moly Vanadium steel with nitride finish, promoting longevity and resilience. The M4 profile balances weight distribution with structural rigidity. Featuring a 1-8 twist rate, this barrel ensures precision accuracy across a wide range of bullet weights from 55-grain to 77-grain projectiles. The nitride finish provides wear resistance and corrosion protection. The carbine-length gas system guarantees reliable cycling and performance with standard 5.56 NATO ammunition. The 1/2x28 thread pitch accommodates standard AR-15 muzzle devices.

A2 Upper Receiver and Quad-Rail Handguard

The upper includes a 7075-T6 anodized aluminum A2 upper receiver for superior strength and corrosion resistance. The anodized finish provides wear protection and durability. Paired with a black quad-rail handguard crafted from 6061-T6 aluminum, this setup provides ample space for accessory mounting on all four sides. The quad-rail design allows attachment of lights, grips, lasers, and other accessories without additional mounting systems. The front sight base integrates with the gas block for traditional iron sight capability.

Nitride Bolt Carrier Group and Complete Upper

With the integrated 8620 alloy steel bolt carrier group with nitride finish, this complete upper delivers low-friction operation and extended service life. This multi-caliber BCG is compatible with 5.56, .223, .300, and .350 calibers for build flexibility. The mil-spec AR-15 M4 charging handle provides reliable operation. Completing the setup is a GI birdcage flash hider with 1/2x28 threading for flash reduction. This complete upper is ideal for gunsmiths who value functionality and versatility in their firearms with carbine-length gas systems.

Follow safe handling practices and manufacturer instructions at all times.

Ensure compliance with all applicable laws.

Verify proper installation and function before use.

Confirm secure installation of all components before operation.