Multiple Manufacturers 16" AR-15 A2 Style Upper Receiver Assembly (5.56 NATO, 1:7 Twist)
This AR-15 upper receiver assembly is built around a 16" 5.56mm NATO barrel with a 1:7 twist, paired with an A2-style fixed front sight base and an A2 birdcage flash hider.
Configuration includes a flat-top Picatinny upper receiver and drop-in handguards with a delta ring assembly.