Details
5.56 NATO AR-15 Pistol Upper Build Kit | 10.5" Nitride Barrel | Davidson Defense Past Due | 1:8 Twist | FSB | Quad-Rail Handguard | Suppressor Ready
A robust and reliable addition for firearm enthusiasts, the Davidson Defense Past Due 5.56 NATO pistol upper build kit delivers durability and versatile customization. Chambered in 5.56 NATO, this kit features a 10.5-inch barrel constructed from 4150 Chrome Moly Vanadium with nitride finish, ensuring exceptional durability and resistance to wear. The M4 barrel profile with a 1:8 twist rate provides consistent accuracy across various bullet weights, and it operates on a carbine-length gas system for reliable cycling. The barrel features a 1/2x28 thread pitch, making this upper build kit suppressor-ready for enhanced shooting versatility. The upper receiver made from 7075 T6 aluminum includes M4 feed ramps and an anodized finish for added protection against corrosion and enhanced feeding reliability. The kit's quad-rail handguard made from 6061-T6 aluminum provides versatile positioning for accessories at multiple mounting locations. This upper build kit offers efficiency and customization for the intended applications.
Key Features
- 10.5" Nitride-Finished Barrel | 5.56 NATO Chambering – 4150 Chrome Moly Vanadium with M4 profile and 1:8 twist rate
- Upper Build Kit – Includes all upper components for streamlined assembly
- Suppressor Ready – 1/2x28 thread pitch for suppressor compatibility
- 7075 T6 Aluminum Upper Receiver – M4 feed ramps and anodized finish for corrosion protection
- Quad-Rail Handguard – 6061-T6 aluminum for versatile accessory positioning
- Front Sight Base – Integrated iron sight capability
- Carbine-Length Gas System – Reliable cycling across ammunition types
- M4 Feed Ramps – Enhanced feeding reliability with various ammunition types
- Nitride Finish – Exceptional durability and resistance to wear
Perfect For
- Firearm enthusiasts seeking a robust and reliable upper build
- Shooters who value suppressor-ready capability
- Builders looking for versatile accessory positioning with quad-rail design
- Tactical users demanding efficiency and customization
- AR-15 owners seeking durability and resistance to wear
Suppressor-Ready Design
This upper build kit is suppressor-ready, featuring a 1/2x28 thread pitch that provides compatibility with suppressors and various muzzle devices commonly used with 5.56 NATO platforms. The suppressor-ready design offers enhanced shooting versatility, allowing you to add a suppressor for reduced noise signature and improved recoil management when desired. The threaded barrel accepts a wide range of muzzle devices including flash hiders, muzzle brakes, and compensators, providing flexibility for different shooting applications and preferences. Verify proper suppressor mounting and compatibility before use.
Nitride-Finished M4 Profile Barrel
The 10.5-inch barrel constructed from 4150 Chrome Moly Vanadium with nitride finish ensures exceptional durability and resistance to wear for long-term performance. The nitride treatment provides superior surface hardness and corrosion protection, maintaining barrel functionality even under demanding conditions. The M4 barrel profile is a proven contour that balances weight and rigidity for consistent accuracy. With a 1:8 twist rate, this barrel provides reliable performance across various bullet weights from lightweight to heavy projectiles. The carbine-length gas system ensures reliable cycling across different 5.56 NATO and .223 Remington ammunition types.
M4 Feed Ramps and Quad-Rail Versatility
The upper receiver made from 7075 T6 aluminum includes M4 feed ramps and an anodized finish for added protection against corrosion and enhanced feeding reliability. The M4 feed ramps ensure smooth feeding with various ammunition types and bullet profiles, improving consistent function across different loads. The anodized finish provides long-term protection against environmental stress and wear. The quad-rail handguard made from 6061-T6 aluminum provides versatile positioning for accessories at 12, 3, 6, and 9 o'clock positions, offering maximum flexibility for mounting lights, lasers, vertical grips, and other tactical accessories. The Front Sight Base provides integrated iron sight capability.
Efficient and Customizable Upper Build
This upper build kit provides all upper components needed for efficiency and customization: upper receiver with M4 feed ramps and anodized finish, 10.5-inch nitride-finished barrel with M4 profile and suppressor-ready threading, quad-rail handguard for versatile accessory positioning, carbine-length gas system with Front Sight Base, and muzzle device. The combination of robust construction, reliable performance, suppressor-ready capability, and versatile customization options creates an upper ideal for tactical applications, home defense, and range use. This kit is an excellent choice for firearm enthusiasts seeking durability, resistance to wear, and the flexibility to configure their upper for intended applications including suppressed shooting.
Disclaimer: This is an upper build kit including all upper components except BCG and Charging Handle. 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 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.
