Featuring a rugged 7075 aluminum housing with a fully enclosed, sealed, and Argon-purged optical system, 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’s deck height is the lowest in the industry, allowing for effortless co-witness with standard height irons and is available in both PRO and COMPACT standardized footprints. Building up SIG SAUERs DNA of trusted military innovation, the ROMEO-X Enclosed delivers streamlined dependability without compromise. ROMEO-X Enclosed. Where X marks the dot. IPX-7 waterproof.