Designed for steady, repeatable performance in varied environments, the Lmt Defense MRP-L M-LOK 5.56/300 BLK 13.25'' Assembled Upper Receiver emphasizes functional reliability and straightforward operation. Constructed from aerospace-grade aluminum, this upper receiver features a monolithic rail platform for enhanced strength and precision alignment. Ideal for range training and recreational shooting, it supports quick barrel swaps with its patented locking system. Lmt Defense is renowned for its innovative engineering and commitment to quality.