Details
Davidson Defense Lockdown 10.5" .300 Blackout AR-15 Pistol Full Build Kit | SBA5 Brace | 1:8 Twist | Government Profile | Quad Rail Handguard
This Davidson Defense Lockdown complete pistol build kit is tailored for precision and versatility in .300 Blackout applications. Built around a compact 10.5-inch barrel with government profile and 1:8 twist rate crafted from durable 4150 Chrome Moly Vanadium steel with nitride finish, this kit optimizes accuracy and stability across subsonic and supersonic loads. The barrel is threaded 5/8x24 and equipped with a GI birdcage flash hider for effective flash suppression. The 7075-T6 aluminum upper receiver is anodized for added resilience and includes M4 feed ramps for improved reliability. The carbine-length quad-rail handguard provides ample space for accessories on all four sides, while the low-profile micro gas block located under the handguard ensures efficient gas operation within the pistol-length gas system. Equipped with the SB Tactical SBA5 stabilizing brace for stability and improved handling, this full build kit combines essential features for gunsmiths who appreciate freedom and performance in their firearms.
Key Features
- 10.5" Government Profile Barrel – 4150 CrMoV steel with nitride finish and 1:8 twist rate for accuracy and stability
- Pistol-Length Gas System – Low-profile micro gas block for efficient gas operation (located under handguard)
- Front Sight Post – Integrated sight (not used as gas block; gas block is located under handguard)
- 5/8x24 Thread Pitch – Compatibility with .300 Blackout muzzle devices and suppressors
- 7075-T6 Aluminum Upper Receiver – Anodized for added resilience with M4 feed ramps
- Carbine-Length Quad-Rail Handguard – Ample space for accessories on all four sides
- SB Tactical SBA5 Stabilizing Brace – Stability for improved handling
- Complete Bolt Carrier Group – Reliable cycling with .300 Blackout ammunition
- GI Birdcage Flash Hider – Effective flash suppression included
Perfect For
- Gunsmiths who appreciate freedom and performance in .300 Blackout firearms
- Shooters seeking precision and versatility with government profile barrel
- Builders who want the stability of SB Tactical's SBA5 brace design
- Those needing extensive quad-rail mounting for lights, lasers, and accessories
Government Profile Barrel for Precision
The compact 10.5-inch barrel utilizes a government profile design crafted from durable 4150 Chrome Moly Vanadium steel with a nitride finish for exceptional corrosion resistance and longevity. The government profile optimizes accuracy and stability 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, ensuring consistent precision.
5/8x24 Threading and Flash Suppression
The barrel is threaded 5/8x24, the standard threading for .300 Blackout platforms, ensuring compatibility with a wide range of muzzle devices including suppressors, compensators, and flash hiders. This threading versatility allows you to adapt the platform to your specific shooting preferences and applications. The included GI birdcage flash hider provides effective flash suppression, reducing visible flash signature for improved visibility during shooting sequences. This combination of standard threading and included flash hider gives you immediate functionality with the option to upgrade to specialized muzzle devices as your needs evolve.
Efficient Gas Operation
The pistol-length gas system features a low-profile micro gas block located under the handguard, ensuring efficient gas operation with .300 Blackout ammunition across various loads and shooting conditions. The micro gas block maintains an extremely clean appearance under the handguard while providing reliable gas delivery to the bolt carrier for proper cycling. 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 low-profile micro gas block is located under the handguard.
Carbine-Length Quad-Rail Handguard
The carbine-length quad-rail handguard provides ample space for accessories on all four sides, enabling comprehensive customization for your specific shooting requirements. Picatinny rails offer extensive mounting options for lights, lasers, foregrips, pressure switches, and other tactical gear exactly where you need them. This maximum mounting flexibility supports the versatility this build kit offers, whether you're configuring for tactical applications, hunting scenarios, or recreational use. The quad-rail design accommodates multiple accessories simultaneously while maintaining a functional, purpose-driven profile.
SBA5 Brace and Upper Assembly
The SB Tactical SBA5 stabilizing brace adds stability for improved handling during shooting. The SBA5's minimalist design maintains the compact profile essential to pistol configurations while offering enhanced stability that contributes to accuracy and control. The 7075-T6 aluminum upper receiver is anodized for added resilience and corrosion resistance. The upper includes M4 feed ramps for improved reliability, guiding cartridges smoothly from magazine to chamber across various .300 Blackout magazines and ammunition types. This full build kit combines essential features that work together seamlessly, delivering the freedom and performance gunsmiths appreciate in their firearms.
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.
