The SIG SAUER Romeo5 Compact Red-Dot Sight (SOR52001) is a high-quality optic designed for various firearms including handguns, shotguns, and rifles. It features a 2 MOA dot reticle in red, with a 20mm objective lens diameter and fully multicoated lens for clear and precise aiming. Constructed from lightweight aluminum, this sight is shockproof, waterproof, and illuminated for improved visibility in low-light conditions. With a Picatinny mount for easy attachment, this red-dot sight is a reliable and versatile accessory for enhancing your shooting experience.i opened the box to call the company , to make sure it was not counterfeit. Sig Sauer has confirmed the serial number as well as pictures of the item ,