Davidson Defense Lockdown w/SBA3 Brace 10.5-inch Pistol-Gas 1:8 .300 BLK AR-15 FSB Carbine-Length Quad-Rail Handguard Pistol Full Build Kit

Davidson Defense Lockdown 10.5" .300 Blackout AR-15 Pistol Full Build Kit | SBA3 Adjustable Brace | 1:8 Twist | Government Profile | Quad Rail Handguard

This Davidson Defense Lockdown full build kit is engineered for versatility and customization in .300 Blackout applications. Built around a 10.5-inch barrel with government profile crafted from 4150 Chrome Moly Vanadium steel with nitride finish and 1:8 twist rate, this kit provides durability and reliability across subsonic and supersonic loads. The pistol-length gas system with low-profile gas block located under the handguard ensures optimal performance. The AR-15 upper receiver crafted from 7075-T6 aluminum pairs with a drop-in carbine-length quad-rail handguard for accessory attachment and improved handling on all four sides. Equipped with the SB Tactical SBA3 adjustable pistol brace for stability, complete bolt carrier group, low-profile gas block, and GI birdcage flash hider, this full build kit offers a robust platform for a variety of shooting experiences and applications.

Key Features

• 10.5" Government Profile Barrel – 4150 CrMoV steel with nitride finish and 1:8 twist rate
• Pistol-Length Gas System – Optimal performance with low-profile gas block (located under handguard)
• Front Sight Post – Integrated sight (not used as gas block; gas block is located under handguard)
• 7075-T6 Aluminum Upper Receiver – Durable construction for reliable performance
• Drop-In Carbine-Length Quad-Rail Handguard – Accessory attachment and improved handling on all four sides
• SB Tactical SBA3 Adjustable Pistol Brace – Stability with five-position adjustability
• Complete Bolt Carrier Group – Reliable cycling with .300 Blackout ammunition
• Low-Profile Gas Block – Clean appearance under handguard with consistent gas delivery
• GI Birdcage Flash Hider – Effective flash suppression included

Perfect For

• Shooters who appreciate freedom and versatility in .300 Blackout pistol applications
• Builders seeking a customizable platform with proven SBA3 brace design
• Tactical applications requiring quad-rail accessory mounting on all four sides
• Those wanting a robust platform for a variety of shooting experiences

Government Profile Barrel with Nitride Finish

The 10.5-inch barrel features a government profile made from 4150 Chrome Moly Vanadium steel with a nitride finish for exceptional durability and reliability. The government profile provides proven strength while maintaining manageable weight for pistol configurations. The 1:8 twist rate ensures reliable stabilization for .300 Blackout ammunition across both subsonic loads (typically 190-220 grains) and supersonic loads (110-125 grains). This versatility makes the barrel equally capable for suppressed subsonic shooting with minimal sound signature and high-velocity supersonic applications for maximum energy delivery. The nitride finish extends barrel life and maintains consistent performance even under demanding use.

Pistol-Length Gas System with Low-Profile Gas Block

The pistol-length gas system utilizes a low-profile gas block located under the handguard for optimal performance with the 10.5-inch barrel. This system ensures consistent cycling with .300 Blackout ammunition across various loads and shooting conditions. The low-profile design maintains a clean appearance under the handguard while providing reliable gas delivery to the bolt carrier for proper cycling. This configuration is optimized for both subsonic and supersonic ammunition, ensuring the robust platform performs reliably across a variety of shooting experiences. Note: The front sight post is not used as a gas block; the low-profile gas block is located under the handguard.

Drop-In Carbine-Length Quad-Rail Handguard

The drop-in carbine-length quad-rail handguard allows for accessory attachment and improved handling on all four sides. Picatinny rails provide comprehensive mounting options for lights, lasers, foregrips, pressure switches, and other tactical gear exactly where you need them. The drop-in design simplifies installation while maintaining the rigidity necessary for maintaining accessory zero. This maximum mounting flexibility enables complete customization for your specific shooting preferences, whether for tactical applications, hunting, or recreational use. The quad-rail configuration accommodates multiple accessories simultaneously, supporting the versatility this build kit offers.

SB Tactical SBA3 Adjustable Pistol Brace

The SB Tactical SBA3 adjustable pistol brace provides stability with five-position adjustability for customizable length of pull. The split-tube design with adjustable nylon straps offers improved stability during use while maintaining the lightweight profile essential to pistol configurations. The SBA3's proven design has become an industry standard for AR pistol builds, offering shooters a reliable platform for controlled shooting and improved accuracy. The adjustable configuration accommodates shooters of different sizes and allows for quick length changes based on clothing layers or shooting scenarios, enhancing the overall versatility of this platform.

Complete Assembly Components

This full build kit includes a 7075-T6 aluminum upper receiver for durable construction and reliable performance. The complete bolt carrier group ensures reliable cycling with .300 Blackout's unique operating characteristics. The low-profile gas block provides consistent gas delivery while maintaining a clean profile under the handguard. The GI birdcage flash hider completes the assembly with effective flash suppression, reducing visible flash signature for improved visibility during shooting sequences. All components work together to create a robust platform suitable for those who appreciate freedom in their shooting applications and want a versatile, customizable .300 Blackout pistol.

Always follow safe handling and manufacturer instructions.

Ensure compliance with all applicable federal, state, and local laws.

Verify compatibility with your lower receiver and brace usage regulations before assembly.