Details
'More Perfect Union' 16.5-Inch AR-15 5.56 NATO Nitride Rifle Upper Build Kit
The More Perfect Union Upper Build Kit is built around a Mercury Precision "Satellite" 16.5-inch 5.56 NATO barrel in a government profile, with a mid-length gas system, a 1:7 twist, and a Nitride finish. It is paired with a Davidson Defense Black Diamond Series billet upper receiver and a Unique-ARs "We The People" 15-inch handguard. A Recoil Technologies A2 GI birdcage flash hider finishes the muzzle. The 1:7 twist suits a wide range of bullet weights in 5.56 NATO, and the billet receiver and distinctive handguard give the build a clean, patriotic look. BCG and charging handle are not included.
Key Features
- Mercury Precision "Satellite" 16.5-inch government profile barrel, Nitride finish, 1:7 twist, 5.56 NATO, 1/2x28 muzzle threads
- Mid-length gas system with a mid-length stainless steel gas tube and a micro low-profile steel gas block sized for a .750-inch barrel
- Davidson Defense Black Diamond Series billet upper receiver
- Unique-ARs "We The People" 15-inch handguard
- Recoil Technologies A2 GI birdcage flash hider, rated for 5.56/.223, on 1/2x28 threads
- BCG and charging handle are not included.
Barrel and Gas System
The 16.5-inch "Satellite" barrel from Mercury Precision is built in a government profile and chambered in 5.56 NATO, with a 1:7 twist rate suited to a wide range of bullet weights. It is finished in Nitride, a surface treatment that adds hardness and corrosion resistance while leaving a clean, matte black look. The barrel runs a mid-length gas system through a stainless steel gas tube and a micro low-profile steel gas block sized for a .750-inch barrel, and the low-profile block helps it sit cleanly beneath the handguard. At the muzzle, 1/2x28 threads carry the included Recoil Technologies A2 GI birdcage flash hider.
Upper Receiver and Handguard
The upper receiver is a Davidson Defense Black Diamond Series billet unit, machined for a clean, precise look. It is paired with the Unique-ARs "We The People" 15-inch handguard, whose custom design sets the build apart from a standard vented handguard.
Compatibility
This kit is built for AR-15 lower receivers chambered in 5.56 NATO. Barrel material, upper receiver material, finish, and forward assist configuration, handguard material, finish, attachment system, and free-float configuration, crush washer inclusion, and ejection port door configuration were not supplied with this listing and should be confirmed before purchase. Because the BCG and charging handle are not included, they must be sourced separately to complete the upper.
Follow all manufacturer instructions and safe handling practices.
Ensure compliance with all applicable federal, state, and local laws.
