Davidson Defense Lockdown 10.5-inch Pistol-Gas 1:8 .300 BLK AR-15 FSB Carbine-Length Quad-Rail Handguard Pistol Full Build Kit, SBR Ready

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

This Davidson Defense Lockdown full build kit is optimized for versatility and performance in .300 Blackout applications. Built around a 10.5-inch front sight base barrel with government profile crafted from 4150 Chrome Moly Vanadium steel with nitride treatment and 1:8 twist rate, this kit ensures stability and precision across subsonic and supersonic loads. The 5/8x24 thread pitch provides compatibility with .300 Blackout muzzle devices and suppressors. The carbine-length quad-rail handguard constructed from lightweight aluminum allows for ample accessory attachments while maintaining a sleek black profile on all four sides. Equipped with an AR-15 upper receiver with M4 feed ramps, mil-spec charging handle, complete bolt carrier group made from 9310 and 8620 alloy steels with nitride finish, heavy-duty mil-spec 6-position buffer tube, and gas block located under the handguard for reliable function, this SBR Ready kit provides adjustability for various shooting applications, making it ideal for the discerning gunsmith.

Key Features

• 10.5" Front Sight Base Barrel – 4150 CrMoV steel with nitride treatment, government profile, and 1:8 twist rate
• Pistol-Length Gas System – Gas block for reliable function (located under handguard)
• Front Sight Base – Integrated aiming solution (not used as gas block; gas block is located under handguard)
• 5/8x24 Thread Pitch – Compatibility with .300 Blackout muzzle devices and suppressors
• Carbine-Length Quad-Rail Handguard – Lightweight aluminum with ample accessory attachments on all four sides
• AR-15 Upper Receiver – M4 feed ramps for reliable feeding
• Complete Bolt Carrier Group – 9310 and 8620 alloy steels with nitride finish
• Heavy-Duty Mil-Spec 6-Position Buffer Tube – Adjustability for various shooting applications
• SBR Ready Configuration – Ships without a brace; choose your preferred final setup via configuration

Perfect For

• Discerning gunsmiths seeking versatility and performance in .300 Blackout builds
• Builders who want SBR flexibility with integrated front sight capability
• Shooters requiring extensive quad-rail mounting for tactical accessories
• Those prioritizing stability and precision with government profile barrel

Government Profile Barrel with Front Sight Base

The 10.5-inch front sight base barrel features a government profile made from 4150 Chrome Moly Vanadium steel with a nitride treatment for exceptional durability and corrosion resistance. The government profile ensures stability and precision 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 front sight base provides an integrated aiming solution that requires no batteries and remains functional in all conditions.

5/8x24 Thread Pitch and Gas System

The barrel features a 5/8x24 thread pitch, 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 applications and preferences. The pistol-length gas system with gas block located under the handguard provides reliable function across various ammunition types and shooting conditions, ensuring consistent cycling whether you're running subsonic or supersonic loads. Note: The front sight base is not used as a gas block; the gas block is located under the handguard.

Carbine-Length Quad-Rail Handguard

The carbine-length quad-rail handguard is constructed from lightweight aluminum with a sleek black profile and allows for ample accessory attachments 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 lightweight aluminum construction keeps overall weight manageable while providing a rigid mounting platform that maintains zero for precision equipment. This maximum mounting flexibility enables complete customization for various shooting applications, from tactical scenarios to recreational use.

Complete Upper Assembly and BCG

The AR-15 upper receiver features M4 feed ramps that guide cartridges smoothly from magazine to chamber, ensuring reliable feeding across various .300 Blackout magazines and ammunition types. The complete bolt carrier group is made from 9310 and 8620 alloy steels with a nitride finish for exceptional hardness, corrosion resistance, and reliable cycling with .300 Blackout's unique operating characteristics. The mil-spec charging handle provides smooth operation for quick manipulation during shooting sequences. The heavy-duty mil-spec 6-position buffer tube provides robust construction and adjustability for various shooting applications.

SBR Ready Configuration

The SBR Ready configuration is designed for customers who want a build kit without a brace included. This allows you to choose your preferred final setup based on your specific needs and compliance requirements. The kit ships without a brace, giving you full control over how you configure your .300 Blackout pistol build. See configuration options for available setups. This flexibility makes the kit ideal for the discerning gunsmith who wants complete control over the final configuration, whether building a pistol with a brace or pursuing other compliant configurations optimized for versatility and performance.

Always follow safe handling and manufacturer instructions.

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

SBR Ready configuration ships without a brace. Know and follow all applicable laws, and don't install a stock unless compliant.

Verify compatibility with your lower receiver before assembly.