Details
Davidson Defense Lockdown 10.5" Pistol-Gas .300 Blackout AR-15 Complete Upper Assembly | 1:8 Twist | Quad Rail Handguard | Micro Low-Profile Gas Block
This Davidson Defense Lockdown complete upper assembly is engineered for reliability and versatility in a compact .300 Blackout configuration. Built around a 10.5-inch .300 Blackout barrel with 1:8 twist rate crafted from 4150 Chrome Moly Vanadium steel with durable nitride coating, this upper provides enhanced longevity and performance across various applications. The carbine-length quad-rail handguard constructed from aluminum allows for accessory attachment while contributing to a lightweight profile on all four sides. The 7075-T6 aluminum upper receiver is anodized for corrosion resistance and includes M4 feed ramps for optimal feeding. Equipped with a micro low-profile gas block located under the handguard for smooth operation, mil-spec charging handle, complete bolt carrier group, and GI birdcage flash hider to minimize signature, this complete upper is compatible with AR-15 platforms and offers customizable options for the discerning gunsmith.
Key Features
- 10.5" .300 Blackout Barrel – 4150 CrMoV steel with durable nitride coating and 1:8 twist rate
- Pistol-Length Gas System – Micro low-profile gas block for smooth operation (located under handguard)
- Front Sight Post – Integrated sight (not used as gas block; gas block is located under handguard)
- Carbine-Length Quad-Rail Handguard – Aluminum construction for lightweight accessory attachment on all four sides
- 7075-T6 Aluminum Upper Receiver – Anodized for corrosion resistance with M4 feed ramps
- Micro Low-Profile Gas Block – Clean appearance under handguard with reliable gas delivery
- Complete Bolt Carrier Group – Reliable cycling with .300 Blackout ammunition
- Mil-Spec Charging Handle – Smooth operation included
- GI Birdcage Flash Hider – Minimizes flash signature
Perfect For
- Shooters seeking reliability and versatility in compact .300 Blackout configurations
- Builders who want a complete upper ready for installation on AR-15 platforms
- Discerning gunsmiths looking for customizable options with quad-rail mounting
- Those prioritizing enhanced longevity with nitride-coated barrel construction
4150 CrMoV Barrel with Nitride Coating
The 10.5-inch .300 Blackout barrel is crafted from 4150 Chrome Moly Vanadium steel with a durable nitride coating for exceptional corrosion resistance and enhanced longevity. The 1:8 twist rate is designed to perform effectively across various applications with .300 Blackout ammunition, providing reliable stabilization for 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 coating extends barrel life and maintains consistent performance even under demanding use in compact configurations.
Micro Low-Profile Gas Block
The pistol-length gas system features a micro low-profile gas block located under the handguard, ensuring smooth operation with .300 Blackout ammunition across various loads and shooting conditions. The micro low-profile design 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 upper performs reliably whether you're running subsonic or supersonic ammunition across various applications. 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 is constructed from aluminum and allows for the attachment of accessories while contributing to a lightweight profile. Picatinny rails on all four sides provide comprehensive mounting options for lights, lasers, foregrips, pressure switches, and other tactical gear exactly where you need them. The aluminum construction keeps overall weight manageable, making this compact configuration easier to handle during extended shooting sessions. This maximum mounting flexibility enables customization for the discerning gunsmith, whether configuring for tactical applications, hunting, or recreational use.
Upper Receiver with M4 Feed Ramps
The 7075-T6 aluminum upper receiver is anodized for corrosion resistance and long-term durability in various environments. The upper includes M4 feed ramps for optimal feeding, guiding cartridges smoothly from magazine to chamber to ensure reliable feeding across various .300 Blackout magazines and ammunition types. The 7075-T6 alloy provides superior strength compared to standard 6061 aluminum, making it ideal for applications where reliability matters. The anodized finish protects against environmental exposure and handling wear, contributing to the enhanced longevity this complete upper offers.
Complete Upper Assembly Components
This complete upper includes a mil-spec charging handle for smooth operation and quick manipulation during shooting sequences. The complete bolt carrier group ensures reliable cycling with .300 Blackout's unique operating characteristics. The GI birdcage flash hider minimizes flash signature, reducing visible flash for improved visibility during shooting sequences. All components are engineered to work together seamlessly, creating a complete upper that's compatible with AR-15 platforms and ready for installation. The customizable options and reliable performance make this upper ideal for the discerning gunsmith seeking versatility in a compact .300 Blackout configuration.
Always follow safe handling and manufacturer instructions.
Ensure compliance with all applicable federal, state, and local laws.
Verify compatibility with your lower receiver before installation.
