The ROMEO-X Enclosed optimizes strength and reliability for the concealed environment. Featuring a CNC 7075 aluminum housing and aspherical glass lens system built around a high-efficiency point source emitter, the ROMEO-X Enclosed creates a rock-solid, distortion free, aiming solution for the most demanding shooters and circumstances. Equipped with a side-mounted battery compartment and SIG SAUERs patent-pending beryllium copper flexure system, the ROMEO-X Enclosed ultra-low deck height allows for co-witness with standard height irons.