Details
5.56 NATO AR-15 Complete Pistol Upper | 10.5" Nitride Barrel | Davidson Defense Past Due | 1:8 Twist | BCG & Charging Handle Included | FSB | Quad-Rail | Suppressor Ready
Engineered for the discerning gunsmith seeking versatility and reliability in a compact platform, the Davidson Defense Past Due 5.56 NATO complete pistol upper delivers precision and proven components. Chambered in 5.56 NATO, this upper features a robust 10.5-inch M4 profile barrel made from 4150 Chrome Moly Vanadium with nitride finish and a 1:8 twist rate for improved stability and precision across various bullet weights. The carbine-length gas system ensures reliable cycling, while the front sight base (FSB) provides optimal sight alignment and integrated iron sight capability. Complementing the barrel is a durable carbine-length quad-rail handguard made from 6061-T6 aluminum, allowing for ample accessory mounting options at multiple positions. The upper receiver is constructed from 7075-T6 aluminum, anodized for enhanced wear resistance and corrosion protection. This complete upper build comes with an AR-15 M4 charging handle and a high-quality bolt carrier group made from 9310 and 8620 alloy steels, finished in nitride for longevity. This setup is suppressor-ready and designed for freedom-focused enthusiasts.
Key Features
- 10.5" Nitride-Finished Barrel | 5.56 NATO Chambering – 4150 Chrome Moly Vanadium with M4 profile and 1:8 twist rate for precision
- Complete Upper Build – Includes bolt carrier group, charging handle, and all upper components
- Suppressor Ready – Threaded barrel for suppressor compatibility
- High-Quality Bolt Carrier Group – 9310 and 8620 alloy steels with nitride finish for longevity
- 7075-T6 Aluminum Upper Receiver – Anodized for enhanced wear resistance
- Carbine-Length Quad-Rail Handguard – Durable 6061-T6 aluminum with ample accessory mounting
- Front Sight Base – Optimal sight alignment with integrated iron sight capability
- Carbine-Length Gas System – Reliable cycling across ammunition types
- AR-15 M4 Charging Handle – Consistent operation and dependable function
Perfect For
- Discerning gunsmiths seeking versatility and reliability
- Freedom-focused enthusiasts who value suppressor-ready capability
- Shooters who want all upper components ready for assembly
- Builders looking for ample accessory mounting in a compact platform
- Tactical users demanding improved stability and precision
Complete Upper Components
This complete upper includes everything you need—high-quality bolt carrier group made from 9310 and 8620 alloy steels with nitride finish for longevity, AR-15 M4 charging handle, and all upper receiver components. The BCG's nitride treatment provides exceptional durability and corrosion resistance for reliable cycling and long-term dependable performance. The AR-15 M4 charging handle delivers consistent operation and smooth manipulation shot after shot. This setup is suppressor-ready, featuring threaded barrel for suppressor compatibility, allowing for reduced noise signature and improved recoil management when using a suppressor. This comprehensive component package eliminates the need to source individual upper parts separately.
Nitride-Finished M4 Profile Barrel
The robust 10.5-inch M4 profile barrel made from 4150 Chrome Moly Vanadium with nitride finish delivers improved stability and precision for demanding applications. The nitride treatment provides superior wear resistance and corrosion protection, maintaining barrel functionality even under sustained use. The M4 profile balances weight and rigidity for consistent accuracy. With a 1:8 twist rate, this barrel ensures precision across various bullet weights from lightweight 55-grain to heavier 77-grain projectiles, stabilizing ammunition for versatile performance. The carbine-length gas system with front sight base ensures reliable cycling while providing optimal sight alignment and integrated iron sight capability.
Quad-Rail Handguard and Enhanced Wear Resistance
The durable carbine-length quad-rail handguard made from 6061-T6 aluminum allows for ample accessory mounting options at 12, 3, 6, and 9 o'clock positions. This four-sided Picatinny rail coverage provides maximum flexibility for attaching lights, lasers, vertical grips, bipods, and other tactical accessories exactly where you need them in a compact platform. The upper receiver constructed from 7075-T6 aluminum is anodized for enhanced wear resistance and corrosion protection, ensuring long-term dimensional stability and dependable function. The anodized finish protects against environmental stress for reliable performance over time.
Versatile and Reliable Complete Upper
This complete upper build provides all upper components needed for versatility and reliability in a compact platform: upper receiver with anodized finish for enhanced wear resistance, 10.5-inch nitride-finished barrel with M4 profile and front sight base, carbine-length quad-rail handguard with ample mounting options, high-quality bolt carrier group made from 9310 and 8620 alloy steels with nitride finish for longevity, AR-15 M4 charging handle, and muzzle device. The suppressor-ready design provides compatibility with suppressors for reduced signature when desired. Engineered for freedom-focused enthusiasts, this complete upper delivers the improved stability, precision, and reliable cycling needed for tactical applications, home defense, and range use in a compact, versatile package designed for discerning gunsmiths.
Disclaimer: This is a complete upper assembly. Always follow safe handling practices and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws regarding pistol uppers, barrel lengths, and suppressor use. Verify proper installation and headspacing before use. Verify suppressor compatibility and ensure proper mounting before firing. Use ammunition appropriate for 5.56 NATO or .223 Remington chambering.
