Palmetto State Armory

Overview

The PSA Gen4 8" 9mm Upper Receiver is a complete assembly designed for the AR-9 platform, featuring an 8-inch barrel with a 1:10 twist rate, which optimizes projectile stability and accuracy for 9mm rounds. With a pistol-length gas system, this upper ensures reliable cycling while maintaining a compact profile, making it ideal for close-quarters scenarios. This kit is commonly utilized in builds focused on maneuverability and versatility, perfect for personal defense or recreational shooting.