Lone Star Armory offers premium Carbine Upper Receiver Enhanced (CURE) systems—fully assembled, complete upper receiver groups for AR-15 pattern rifles, designed to elevate an ordinary AR-15 build to the next level. Each system is plug-and-play, including a complete upper receiver paired with a tune pack featuring a buffer spring and weight, ensuring seamless transitions between calibers, barrel lengths, and configurations. Engineered for LSA-grade accuracy, reliability, durability, and ergonomics, these CURE systems enhance versatility and performance, maximizing your rifle’s potential across various shooting scenarios.