Details
Davidson Defense Aftermath 10.5" 5.56 NATO Full Build Kit with SBA3 Brace | 4150 CMV Nitride | Carbine-Gas | FSB | Billet Slick Side | Quad-Rail
The Davidson Defense Aftermath with SBA3 Brace 10.5" 5.56 NATO full build kit is engineered for versatility and reliability in a compact AR-15 pistol platform with streamlined slick side aesthetics. Built around a 10.5-inch barrel chambered in 5.56 NATO, constructed from 4150 Chrome Moly Vanadium steel with nitride finish for enhanced durability and corrosion resistance, this kit delivers consistent performance. The carbine-length gas system with A2 front sight base ensures smooth operation, while the 1:8 twist rate provides effective stabilization of various projectile weights from 55-grain to 77-grain bullets. Equipped with a carbine-length 2-piece quad-rail handguard crafted from aluminum, this build allows for optimum customization and accessory mounting. The upper receiver is crafted from 6061-T6 billet aluminum with slick side design for streamlined performance. The kit includes a complete bolt carrier group made from high-strength 9310 and 8620 alloy steels, Mil-Spec charging handle, mil-spec heavy-duty buffer tube, and all necessary lower parts. The SB Tactical SBA3 adjustable pistol brace provides improved stability and adjustable length-of-pull. A GI birdcage flash hider completes this comprehensive kit, suitable for gunsmiths committed to building a functional and performance-driven AR-15 platform. This kit includes everything except the lower receiver.
Key Features
- 10.5" Barrel: 4150 Chrome Moly Vanadium steel with nitride finish and 1:8 twist rate for enhanced durability and effective stabilization
- Carbine-Length Gas System: Smooth operation with A2 front sight base (FSB) gas block for classic sight configuration
- Complete Bolt Carrier Group: Made from high-strength 9310 and 8620 alloy steels for reliable cycling performance
- Mil-Spec Charging Handle: Standard Mil-Spec design for reliable operation and broad compatibility
- 6061-T6 Billet Aluminum Upper Receiver: Slick side design without forward assist
- Carbine-Length 2-Piece Quad-Rail Handguard: Aluminum construction for optimum customization and accessory mounting
- SB Tactical SBA3 Adjustable Pistol Brace: Improved stability with adjustable length-of-pull for enhanced control
- Mil-Spec Heavy-Duty Buffer Tube: Robust construction for reliable operation and brace compatibility
- GI Birdcage Flash Hider: Effective flash reduction for improved visibility
- A2 Front Sight Base: Standard military-spec FSB for proven sight configuration
- 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
- Gunsmiths and Custom Builders seeking a comprehensive compact pistol build kit with streamlined slick side aesthetics and proven SBA3 brace
- Home Defense and CQB Applications where maneuverability, adjustability, and reliable cycling are critical
- Builders committed to functional and performance-driven platforms with modern design elements
- Shooters wanting versatility and reliability in a compact package with optimum customization options
Barrel Construction and Nitride Finish
The 10.5-inch barrel is constructed from 4150 Chrome Moly Vanadium steel, a proven material choice for strength and durability in compact barrel configurations. The nitride finish enhances surface hardness and provides enhanced durability and superior corrosion resistance, ensuring consistent performance across extended shooting sessions and varied environmental conditions. The 1:8 twist rate provides effective stabilization of various projectile weights, accommodating ammunition from lightweight 55-grain bullets for high-velocity applications to heavier 77-grain match projectiles. This versatile twist rate supports diverse shooting applications, delivering dependable performance and accuracy in the compact 10.5-inch configuration.
Carbine Gas System and Front Sight Base Design
The carbine-length gas system is optimized for shorter barrel lengths like 10.5 inches, ensuring smooth operation with consistent extraction and ejection in compact configurations. The A2 front sight base (FSB) gas block serves dual purposes—functioning as both the gas block and providing a standard military-spec iron sight. This classic FSB configuration has been proven over decades of military use, offering robust construction, reliable performance, and a dependable backup sight system that requires no batteries or electronics. The A2 FSB maintains the traditional AR-15 aesthetic while providing proven functionality valued by shooters who prefer classic AR-15 designs with time-tested reliability.
Bolt Carrier Group and Charging Handle
The included complete bolt carrier group is made from high-strength 9310 and 8620 alloy steels, materials selected for their exceptional strength and durability under the high-pressure cycling demands of the AR-15 platform. The 9310 steel is commonly used for bolt construction due to its superior fatigue resistance, while 8620 alloy steel provides excellent wear characteristics for the carrier body. This combination provides reliable cycling performance across thousands of rounds with consistent extraction and ejection. Paired with a Mil-Spec charging handle, the complete upper ensures smooth, dependable operation and broad compatibility with aftermarket upgrades and accessories.
Billet Slick Side Upper Receiver
The 6061-T6 billet aluminum upper receiver offers a unique combination of strength and streamlined aesthetics. The slick side design eliminates the forward assist, creating a clean, minimalist appearance that reduces weight and complexity while maintaining structural integrity. Billet construction allows for tighter tolerances and enhanced machining detail compared to forged receivers, supporting precise fitment and consistent performance. The slick side configuration is particularly appealing to shooters who prioritize weight savings, simplified operation, and modern aesthetics, emphasizing streamlined performance without unnecessary components in a functional and performance-driven platform.
Quad-Rail Handguard and SBA3 Brace System
The carbine-length 2-piece quad-rail handguard is crafted from aluminum, providing four-sided Picatinny rail coverage at 12, 3, 6, and 9 o'clock positions. The 2-piece design allows for straightforward installation around the front sight base while enabling optimum customization and accessory mounting. This quad-rail design allows for mounting of lights, laser devices, vertical grips, and other Picatinny-compatible accessories at multiple positions, allowing shooters to configure the platform to match their specific needs and maximize versatility. The SB Tactical SBA3 adjustable pistol brace provides improved stability and adjustable length-of-pull for enhanced control and shooter comfort in compact pistol platforms. The adjustable design allows shooters to customize length for enhanced stability and adaptability across different shooting positions, representing proven SB Tactical stabilizing brace technology. Mounted on a mil-spec heavy-duty buffer tube, the SBA3 system ensures robust construction and reliable operation.
Muzzle Device and Complete Build Package
The included GI birdcage flash hider effectively reduces muzzle flash, improving visibility and target tracking during rapid-fire strings and low-light shooting scenarios. Flash reduction is particularly important on shorter barrels like 10.5 inches, where increased muzzle flash is more pronounced. The kit includes a complete lower parts kit with all necessary components for lower receiver assembly, providing gunsmiths with everything needed to complete the pistol build except the lower receiver itself. This comprehensive kit delivers a complete solution for building a functional and performance-driven AR-15 platform with streamlined slick side design, quality high-strength components, proven SBA3 brace technology, and versatile accessory mounting capabilities.
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 5.56 NATO. This kit includes all necessary components to complete the build—lower receiver sold separately.
