Rock River Arms Completed Upper Receiver X-1 .223 Wylde 18 Inch Barrel 1-8 Twist 1/2-28 Threat Free-Float Handguard Brake Tan

Rock River Arms

Overview

The Rock River Arms Completed Upper Receiver X-1 features an 18-inch barrel chambered in .223 Wylde, which allows for both .223 Remington and 5.56 NATO ammunition, making it versatile for various shooting applications. With a 1:8 twist rate, this upper is optimized for stabilizing a wide range of bullet weights, enhancing accuracy over distance. This upper is commonly found in precision builds where effective long-range performance and adaptability are key requirements.