The Kaw Valley Precision AR-15 8.5" 9mm Complete Upper Receiver with 10.25" Carbon Fiber Handguard is the ultimate upper receiver for your custom AR-9 built. This factory-assembled upper features a 7075-T6 aluminum receiver and an ultralightweight free-float carbon fiber handguard designed to provide exceptional strength, improved heat dissipation, and enhanced shot-to-shot accuracy in a streamlined and lightweight package. The 4150 chrome-moly vanadium steel barrel boasts a 1:10 twist for exceptional accuracy with a wide range of 9mm ammo offerings. If that's not enough, this AR-9 upper receiver group ships fully assembled from the factory for reliable, field-ready service without any gunsmithing or custom fitting required. Compatible with any Mil-Spec lower receiver.