Rock River Arms Completed Upper Receiver National Match A4 .223/5.56mm 20 Inch Barrel 1-8 Twist 1/2-28 Thread Free-Float Handguard A2 Flash Hider

Rock River Arms

Overview

The Rock River Arms Completed Upper Receiver National Match A4 is a fully assembled upper designed for the AR-15 platform, featuring a 20-inch barrel specifically chambered for 5.56 NATO. With a 1:8 twist rate, this upper is optimized for stabilizing a wide range of bullet weights, making it versatile for various shooting applications. Builders typically use this upper in precision-oriented setups where accuracy and performance are key, such as in competition shooting or long-range target applications.