Rock River Arms A1 Retro AR-15 Complete Upper Receiver 5.56x45mm NATO 20" Barrel

The Rock River Arms AR-15 Upper Receiver Assembly is designed to pin onto any mil-spec lower receiver. Just add a complete lower and magazine, and you are ready to send lead downrange! FeaturesCarry handle rear sightA1 Triangle handguardA1 Flash hiderMil-spec compatible