The Rise Armament Upper Receiver is a precision-engineered 6mm ARC assembly designed for the AR-Style platform. It features an 18 416R stainless steel barrel with a black Cerakote finish and a 1:7 twist rate, optimized for the high-ballistic coefficient projectiles of the 6mm Advanced Rifle Cartridge. Built on a durable aluminum receiver with a brown finish, this unit is designed for superior long-range accuracy and performance. The barrel is threaded with a 1/2-28 pattern, and the assembly provides a rugged, high-performance foundation for target shooting or specialized hunting applications. Note: The 6mm ARC was specifically developed to provide low-recoil, high-velocity performance that fits within a standard AR-15 sized action, outperforming traditional calibers at extended ranges.