Details
5.56 NATO AR-15 Pistol Full Build Kit | 10.5" Nitride Barrel | SBA5 Brace | Davidson Defense Past Due | 1:8 Twist | FSB | Quad-Rail | Suppressor Ready
Engineered for versatility and performance, the Davidson Defense Past Due 5.56 NATO pistol full build kit delivers advanced features and reliable function. This AR-15 platform features a 10.5-inch carbine-gas barrel in 5.56 NATO, constructed from durable 4150 Chrome Moly Vanadium with nitride finish, and a 1:8 twist for stable projectile spin across various bullet weights. The barrel is threaded at 1/2x28, making it suppressor-ready for versatile shooting applications. Accompanying the barrel is a robust quad-rail handguard made from 6061-T6 aluminum, allowing for ample accessory mounting at multiple positions. The upper receiver crafted from anodized 7075-T6 aluminum includes M4 feed ramps for reliable feeding with various ammunition types. This kit comes with a complete bolt carrier group made from 9310 alloy steel for dependable cycling, a carbine-length stainless steel gas tube for corrosion resistance, and a Mil-Spec AR-15 M4 charging handle. The SB Tactical SBA5 Pistol Stabilizing Brace made from nylon reinforced polymer provides superior stability and comfort. This full build kit is ready for customization and shooting enjoyment, tailored for discerning gunsmiths who value freedom.
Key Features
- 10.5" Nitride-Finished Barrel | 5.56 NATO Chambering – 4150 Chrome Moly Vanadium with 1:8 twist for stable projectile spin
- SB Tactical SBA5 Pistol Stabilizing Brace – Nylon reinforced polymer for superior stability and comfort
- Full Build Kit – Includes all upper components, bolt carrier group, charging handle, and lower parts kit
- Suppressor Ready – 1/2x28 threading for suppressor compatibility
- 9310 Alloy Steel Bolt Carrier Group – Complete BCG for dependable cycling
- Anodized 7075-T6 Aluminum Upper Receiver – M4 feed ramps for reliable feeding
- Quad-Rail Handguard – Robust 6061-T6 aluminum for ample accessory mounting
- Carbine-Length Stainless Steel Gas Tube – Corrosion resistance for long-term reliability
- Front Sight Base – Integrated iron sight capability
- Mil-Spec AR-15 M4 Charging Handle – Dependable operation and consistent function
Perfect For
- Discerning gunsmiths who value freedom in customization
- Shooters seeking versatility and performance with suppressor-ready capability
- Builders looking for advanced SBA5 brace technology and stability
- Home defenders demanding reliable feeding and ample accessory mounting
- AR-15 owners seeking a complete kit ready for shooting enjoyment
SBA5 Brace for Superior Stability and Comfort
The SB Tactical SBA5 Pistol Stabilizing Brace represents the latest evolution in pistol stabilization technology. Made from nylon reinforced polymer, the SBA5 offers exceptional rigidity, superior stability, and enhanced comfort while maintaining a lightweight profile. This brace provides advanced shooter control and support, allowing for improved accuracy and comfort during rapid-fire strings or extended shooting sessions. The modern design integrates seamlessly with the overall build while delivering practical performance benefits that serious shooters demand. Paired with the included buffer system components, this brace ensures reliable operation optimized for the carbine-gas system.
Nitride-Finished Barrel for Stable Projectile Spin
The 10.5-inch carbine-gas barrel constructed from durable 4150 Chrome Moly Vanadium with nitride finish delivers exceptional durability and corrosion resistance for long-term performance. The nitride treatment provides superior wear resistance and reduced friction for smoother operation and easier maintenance. With a 1:8 twist, this barrel ensures stable projectile spin across various bullet weights from lightweight to heavy projectiles, stabilizing ammunition for reliable accuracy and terminal performance. The barrel is threaded at 1/2x28, making it suppressor-ready for versatile shooting applications including reduced noise signature and improved recoil management.
M4 Feed Ramps and Stainless Steel Gas Tube
The upper receiver crafted from anodized 7075-T6 aluminum includes M4 feed ramps for reliable feeding with various ammunition types and bullet profiles. The M4 feed ramps ensure smooth feeding from magazine to chamber, improving consistent function across different loads. The anodized finish provides corrosion resistance and long-term durability. The carbine-length stainless steel gas tube provides corrosion resistance for long-term reliable gas system function. The robust quad-rail handguard made from 6061-T6 aluminum allows for ample accessory mounting at 12, 3, 6, and 9 o'clock positions. The complete bolt carrier group made from 9310 alloy steel ensures dependable cycling.
Ready for Customization and Enjoyment
This full build kit provides everything needed for customization and shooting enjoyment except the lower receiver: upper receiver with M4 feed ramps and anodized finish, 10.5-inch nitride-finished barrel with suppressor-ready threading and Front Sight Base, quad-rail handguard for ample accessory mounting, complete bolt carrier group made from 9310 alloy steel for dependable cycling, carbine-length stainless steel gas tube for corrosion resistance, Mil-Spec AR-15 M4 charging handle, muzzle device, and lower parts kit including SB Tactical SBA5 Pistol Stabilizing Brace and buffer system components. Tailored for discerning gunsmiths who value freedom, this kit delivers the versatility, performance, and superior stability needed for tactical applications, home defense, and range use. This complete full build kit is ready for your customization and shooting enjoyment.
Disclaimer: This kit includes all necessary parts except the lower receiver. Always follow safe handling practices and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws regarding pistol builds, stabilizing braces, and suppressor use. Verify proper installation of all components including gas system and front sight base before use. Verify suppressor compatibility with 1/2x28 thread pitch and ensure proper mounting before firing. Use ammunition appropriate for 5.56 NATO or .223 Remington chambering.
