The Matech MIL-SPEC BUIS W/RANGING delivers reliable back-up iron sight performance with a sleek black finish designed to ride securely on Picatinny rails. Built by Matech as MaTech Solutions, this rear sight features a precise ranging aperture and flip-up functionality, making quick target acquisition and distance estimation practical in dynamic shooting scenarios. The sight is engineered to Fitz Picatinny rails for a snug, rock-solid alignment, ensuring consistent sight picture from shot to shot. When space and reliability matter, the ranging aperture helps shooters gauge distances on the fly, while the flip-up mechanism keeps profile low during movement or when a primary optic is in use. This long gun sight pairs seamlessly with other rifle parts to extend your platforms versatility, providing a trusted, durable backup option that preserves accuracy without adding bulk. Designed for ergonomic one-hand operation and built to withstand field conditions, the BUIS backs up your primary optic with a dependable, fast-to-deploy sighting solution suitable for hunting, duty, or range work where having a proven secondary sight matters.