Davidson Defense Lockdown w/Magpul BTR 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 | Magpul BTR Brace | 1:8 Twist | Government Profile | Quad Rail Handguard

This Davidson Defense Lockdown full build kit is engineered for reliable performance in .300 Blackout applications. Built around a 10.5-inch .300 Blackout barrel with government profile and M4 extension crafted from 4150 Chrome Moly Vanadium steel with nitride finish and 1:8 twist rate, this kit ensures accurate shot placement across subsonic and supersonic loads. The pistol-length gas system with micro low-profile gas block located under the handguard provides reliable cycling. The 7075-T6 aluminum upper receiver features M4 feed ramps and anodized finish for durability. The carbine-length quad-rail handguard provides ample mounting options on all four sides, while the AR-15 M4 charging handle adds ease of operation. Equipped with a complete 9310 alloy steel bolt carrier group with nitride finish, GI birdcage flash hider, and the Magpul BTR pistol brace for stability and improved handling, this kit delivers a complete platform for AR-15 enthusiasts.

Key Features

• 10.5" .300 Blackout Barrel – 4150 CrMoV steel with nitride finish, government profile, M4 extension, and 1:8 twist rate
• Pistol-Length Gas System – Micro low-profile gas block for reliable cycling (located under handguard)
• Front Sight Post – Integrated sight (not used as gas block; gas block is located under handguard)
• 7075-T6 Aluminum Upper Receiver – M4 feed ramps with anodized finish for durability
• Carbine-Length Quad-Rail Handguard – Ample mounting options on all four sides
• Complete 9310 Alloy Steel Bolt Carrier Group – Nitride finish for reliable performance
• AR-15 M4 Charging Handle – Ease of operation for smooth manipulation
• Magpul BTR Pistol Brace – Stability for improved handling
• GI Birdcage Flash Hider – Effective flash suppression included

Perfect For

• AR-15 enthusiasts seeking reliable performance in .300 Blackout pistol platforms
• Shooters who want the stability and comfort of Magpul's BTR brace design
• Builders looking for accurate shot placement with government profile barrel
• Those needing extensive quad-rail mounting for lights, lasers, and accessories

Government Profile Barrel with M4 Extension

The 10.5-inch .300 Blackout barrel features a government profile crafted from 4150 Chrome Moly Vanadium steel with a nitride finish for exceptional durability and long-term reliability. The government profile with M4 extension ensures accurate shot placement while maintaining manageable weight for pistol configurations. The 1:8 twist rate provides 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 even under demanding use.

Pistol-Length Gas System with Micro Low-Profile Gas Block

The pistol-length gas system features a micro low-profile gas block located under the handguard, providing reliable cycling with .300 Blackout ammunition across various loads and shooting conditions. The micro low-profile design maintains an extremely clean appearance under the handguard while ensuring consistent gas delivery to the bolt carrier for proper function. This system is optimized specifically for the 10.5-inch barrel length, ensuring the platform performs reliably whether you're running subsonic or supersonic ammunition. Note: The front sight post is not used as a gas block; the micro low-profile gas block is located under the handguard.

Carbine-Length Quad-Rail Handguard

The carbine-length quad-rail handguard provides ample mounting options on all four sides for comprehensive accessory customization. Picatinny rails offer extensive mounting points for lights, lasers, foregrips, pressure switches, and other tactical gear exactly where you need them. This maximum mounting flexibility enables you to configure the platform for your specific shooting preferences, whether for tactical applications, hunting, or recreational use. The quad-rail design accommodates multiple accessories simultaneously, supporting the versatile performance AR-15 enthusiasts demand.

Magpul BTR Pistol Brace for Stability

The Magpul BTR (Buttstock/Brace) pistol brace provides stability for improved handling during shooting. Magpul's proven design offers a solid platform for controlled shooting while maintaining the compact profile essential to pistol configurations. The BTR brace enhances shooter control and accuracy potential, contributing to accurate shot placement across various shooting scenarios. The design balances stability with lightweight construction, making this full build kit immediately functional for range sessions and field applications with improved handling characteristics.

Complete Upper Assembly and Components

This kit includes a 7075-T6 aluminum upper receiver with M4 feed ramps and anodized finish for durability and reliable feeding across various .300 Blackout magazines and ammunition types. The complete AR-15 bolt carrier group is made from 9310 alloy steel with a nitride finish for exceptional hardness, corrosion resistance, and reliable cycling with .300 Blackout's unique operating characteristics. The AR-15 M4 charging handle adds ease of operation for smooth manipulation during shooting sequences. The GI birdcage flash hider provides effective flash suppression, reducing visible flash signature for improved visibility. All components are engineered to work together seamlessly, delivering the reliable performance AR-15 enthusiasts expect.

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.