Sig Sauer ROMEO-X SIG-LOC Compact 1x Red Dot - 2 MOA Dot / 32 MOA Circle - The SIG-LOC (Leverage Optimized Connection) system was first concepted during the development of the ROMEO-M17, revolutionizing pistol-mounted optic integration with a low-profile, ultra-tough connection between the optic and pistol slide. Designed for precision and strength, SIG-LOC ushers in a new era of expectation and performance for civilians and professionals with the ROMEO-X SIG-LOC pistol-mounted red dot. SIG-LOC is an innovative mounting footprint that establishes five points of contact between the slide and optic to eliminate shift in zero created by extensive shock from recoil and harsh impacts. The unique bottom-mounted design allows for a longer focal length that dramatically reduces parallax and reticle distortion to provide an incredibly forgiving shooting experience. With SIG-LOC, you're investing in technology that has been vetted and trusted by the most demanding users in the world, ensuring superior accuracy and reliability in every situation. FEATURES: A fully enclosed, sealed and purged optical system, for ultimate protection from the elements; Mounting screws secure optic from beneath the pistol slide, utilizing the SIG-LOC mounting system to create 5 total points of contact for the strongest lockup in the industry.; Longer focal length minimizes parallax and produces an ultra-sharp reticle while eliminating distortion.; Inspired by MIL-SPEC ROMEO-M17; Establishes 5 total points of contact to create the strongest lockup in the industry; Longer focal length to dramatically reduce parallax and create an ultra-crisp reticle; Rugged 7075 aluminum housing with a fully enclosed and sealed optical system; Distortion-free aspherical glass lens; MOTAC (Motion Activated Illumination); Industry's lowest deck height for standard-height iron sight co-witness; 20,000 hour battery life with side load battery; 15 illumination settings including 3 dedicated night vision; Assembled in USA; Fully backed by Manufacturer INFINITE GUARANTEE;