Details
Davidson Defense Silent Guardian 7.5" .300 BLK Pistol Full Build Kit with Gauntlet Arms Brace | 4150 CMV Phosphate | Pistol-Gas | 7" M-Lok Freefloat
The Davidson Defense Silent Guardian 7.5" .300 BLK pistol full build kit delivers robust performance for tactical applications and personal defense in the efficient .300 BLK caliber. Built on the AR-15 platform, this kit features a 7.5-inch Saxhorn barrel made from 4150 Chrome Moly Vanadium steel with 1:8 twist rate and phosphate finish for durability and corrosion resistance. The pistol-length gas system utilizes a micro low-profile gas block sized at 0.750 inches, ensuring reliable cycling in the compact configuration. The upper receiver is constructed from 7075-T6 aluminum with anodized finish, paired with a 7-inch freefloat M-Lok handguard made from 6061-T6 aluminum, ensuring stability and modularity. The complete upper includes a complete AR-15 5.56/.223/.300/.350 bolt carrier group made from 9310 alloy steel, mil-spec AR-15 M4 charging handle, and all necessary lower parts. A polymer Gauntlet Arms stabilizing brace enhances control and accuracy. A flash hider with 5/8x24 thread pitch completes the build for effective flash concealment and muzzle management. This kit includes everything except the lower receiver.
Key Features
- 7.5" Saxhorn Barrel: 4150 Chrome Moly Vanadium steel with phosphate finish and 1:8 twist rate chambered in .300 BLK
- Pistol-Length Gas System: Reliable cycling with micro low-profile gas block (0.750) for compact configuration
- Complete Multi-Caliber BCG: Made from 9310 alloy steel for versatile compatibility with .300 BLK
- Mil-Spec AR-15 M4 Charging Handle: Standard design for reliable operation and broad compatibility
- 7075-T6 Aluminum Upper Receiver: Anodized finish for durability and corrosion resistance
- 7" M-Lok Freefloat Handguard: 6061-T6 aluminum for stability and modularity
- Gauntlet Arms Polymer Stabilizing Brace: Enhanced control and accuracy for compact pistol platform
- Flash Hider: 5/8x24 thread pitch for effective flash concealment and muzzle management
- Complete Lower Parts Kit: Includes all necessary components for lower receiver assembly
- Full Build Kit: Includes everything to complete the build except the lower receiver
Perfect For
- Tactical Applications where robust performance and compact maneuverability are critical
- Personal Defense utilizing efficient .300 BLK caliber with enhanced control
- Suppressor Users where 5/8x24 threading and short barrel are ideal for subsonic performance
- Shooters seeking effective flash concealment with stability and modularity
Saxhorn Barrel Construction
The 7.5-inch Saxhorn barrel is made from 4150 Chrome Moly Vanadium steel with phosphate finish, delivering robust performance and corrosion resistance for tactical applications. The phosphate finish (also called Parkerized) provides excellent protection in varied environmental conditions and has been a military standard for decades. The 1:8 twist rate stabilizes the diverse range of .300 BLK projectile weights, from 110-grain supersonic ammunition for maximum velocity to 220-grain subsonic projectiles ideal for suppressed shooting and personal defense applications. This twist rate ensures proper stabilization across the wide ammunition spectrum that makes .300 Blackout particularly versatile for tactical use. The compact 7.5-inch length is particularly well-suited for .300 Blackout's design, delivering superior ballistic performance in short barrel configurations optimized for close-quarters tactical applications.
Pistol-Length Gas System and Upper Receiver
The pistol-length gas system utilizes a micro low-profile gas block sized at 0.750 inches, ensuring reliable cycling in the compact configuration with consistent extraction and ejection. The pistol-length gas system is the shortest standard gas system length, positioned closer to the chamber to ensure adequate gas pressure for reliable operation in very short barrel applications. The micro low-profile design provides a streamlined profile under the freefloat handguard. This gas system length is particularly effective with .300 Blackout, which generates appropriate gas pressure for dependable cycling with both supersonic and subsonic ammunition used in tactical and personal defense scenarios. The 7075-T6 aluminum upper receiver with anodized finish offers exceptional strength-to-weight ratio for durability and corrosion resistance in demanding tactical applications.
Multi-Caliber Bolt Carrier Group and Charging Handle
The included complete AR-15 5.56/.223/.300/.350 bolt carrier group is made from 9310 alloy steel, providing versatile compatibility while being specifically configured for .300 BLK operation. The 9310 alloy steel is selected for its exceptional strength and fatigue resistance, providing excellent wear resistance for reliable long-term performance across thousands of rounds. While this BCG is compatible with multiple calibers that share similar bolt face dimensions, this complete build is chambered specifically for .300 BLK, and shooters should select ammunition that matches the barrel chambering. The mil-spec AR-15 M4 charging handle provides standard design for reliable operation and broad compatibility with aftermarket upgrades and accessories.
M-Lok Freefloat Handguard and Gauntlet Arms Brace
The 7-inch freefloat M-Lok handguard is made from 6061-T6 aluminum, ensuring stability and modularity for tactical accessory configuration. The freefloat design isolates the barrel from external contact, supporting enhanced accuracy potential by eliminating pressure points that can affect barrel harmonics. The M-Lok attachment system provides modular mounting points for lights, laser devices, vertical grips, and other tactical accessories. The 7-inch length provides substantial coverage while maintaining the compact profile critical for tactical maneuverability. The Gauntlet Arms polymer stabilizing brace enhances control and accuracy for the compact pistol platform, supporting improved shooter comfort and stability during tactical operations and personal defense scenarios. The polymer construction ensures lightweight durability while the stabilizing design helps manage the compact platform's characteristics.
Flash Hider and Complete Build Package
The flash hider with 5/8x24 thread pitch completes the build for effective flash concealment and muzzle management in tactical applications. The 5/8x24 threading is the standard thread pitch for .300 Blackout, supporting compatibility with a wide variety of aftermarket muzzle devices including suppressors, which are particularly popular for tactical and personal defense applications due to .300 BLK's excellent performance with subsonic ammunition. Effective flash concealment is particularly important on short barrels for tactical applications where muzzle signature reduction is critical. The kit includes a complete lower parts kit with all necessary components for lower receiver assembly, delivering a comprehensive solution for robust performance in tactical applications and personal defense with the efficient .300 BLK caliber.
Follow safe handling practices and manufacturer instructions for assembly and use. Ensure compliance with all applicable federal, state, and local laws regarding pistol configurations and stabilizing braces. This kit is chambered in .300 BLK. This kit includes all necessary components to complete the build—lower receiver sold separately.
