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

This Davidson Defense Lockdown full build kit is engineered for a versatile and robust .300 Blackout pistol platform. Built around a 10.5-inch .300 Blackout barrel with government profile crafted from 4150 Chrome Moly Vanadium steel with nitride finish and 1:8 twist rate, this kit ensures durability and reliable operation across subsonic and supersonic loads. The pistol-length gas system with gas block located under the handguard ensures reliable cycling. The two-piece aluminum quad-rail handguard in carbine-length provides multiple attachment points for accessories on all four sides, while the AR-15 upper receiver features M4 feed ramps for enhanced feeding reliability. Equipped with a complete 9310 alloy steel bolt carrier group, Gauntlet Arms polymer stabilizing brace for enhanced usability and control, heavy-duty pistol buffer tube, and AR-15/AR-10 flash hider, this comprehensive kit provides everything needed for building a custom firearm suited to your preferences.

Key Features

• 10.5" Government-Profile Barrel – 4150 CrMoV steel with nitride finish and 1:8 twist rate for durability
• Pistol-Length Gas System – Reliable operation optimized for 10.5-inch barrel (gas block located under handguard)
• Front Sight Post – Integrated sight (not used as gas block; gas block is located under handguard)
• Two-Piece Aluminum Quad-Rail Handguard – Carbine-length with multiple attachment points on all four sides
• AR-15 Upper Receiver – M4 feed ramps for enhanced feeding reliability
• Complete 9310 Alloy Steel Bolt Carrier Group – Reliable cycling with .300 Blackout ammunition
• Gauntlet Arms Polymer Stabilizing Brace – Enhanced usability and control
• Heavy-Duty Pistol Buffer Tube – Robust construction for reliable buffer system
• AR-15/AR-10 Flash Hider – Effective muzzle control included

Perfect For

• Gunsmiths seeking a versatile and robust .300 Blackout pistol platform
• Builders who want extensive quad-rail accessory mounting on all four sides
• Shooters looking for a government-profile barrel with reliable cycling
• Those building a custom firearm with comprehensive, quality components

Government-Profile Barrel with Nitride Finish

The 10.5-inch government-profile barrel is crafted from 4150 Chrome Moly Vanadium steel with a nitride finish for exceptional durability and corrosion resistance. The government profile provides reliable 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 even under demanding use, providing the robust performance builders expect.

Pistol-Length Gas System

The pistol-length gas system ensures reliable operation optimized specifically for the 10.5-inch barrel. The gas block is located under the handguard, providing consistent cycling with .300 Blackout ammunition across various loads and shooting conditions. This system delivers the reliable function necessary for both recreational shooting and tactical applications, ensuring proper cycling whether you're running subsonic or supersonic ammunition. Note: The front sight post is not used as a gas block; the gas block is located under the handguard.

Two-Piece Aluminum Quad-Rail Handguard

The two-piece aluminum quad-rail handguard in carbine-length accommodates the government-profile barrel and provides multiple attachment points for accessories on all four sides. Picatinny rails offer comprehensive mounting options for lights, lasers, foregrips, pressure switches, and other tactical gear exactly where you need them. The two-piece design allows for straightforward installation while maintaining the rigidity necessary for maintaining accessory zero. This maximum mounting flexibility is particularly valuable for custom builds requiring multiple accessories positioned around the compact pistol platform, enabling complete customization suited to your preferences.

Complete Upper Assembly and BCG

The AR-15 upper receiver features M4 feed ramps that guide cartridges smoothly from magazine to chamber, enhancing feeding reliability across various .300 Blackout magazines and ammunition types. The complete bolt carrier group is made from 9310 alloy steel for exceptional hardness, corrosion resistance, and reliable cycling with .300 Blackout's unique operating characteristics. The heavy-duty pistol buffer tube provides robust construction for reliable buffer system performance and supports the Gauntlet Arms polymer stabilizing brace securely.

Gauntlet Arms Brace and Flash Hider

The Gauntlet Arms polymer stabilizing brace enhances usability and control for pistol configurations while maintaining a lightweight profile. The polymer construction provides durability and strength without adding unnecessary weight, improving shooter control and accuracy potential. The AR-15/AR-10 flash hider completes the kit with effective muzzle control, reducing visible flash signature for improved visibility during shooting sequences. This comprehensive solution provides everything needed for building a custom .300 Blackout pistol platform that's versatile, robust, and suited to your specific shooting preferences and applications.

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.