Sig Sauer ROMEO-X, Red Dot Sight, 24mm Objective, 32 MOA Circle and 2 MOA Red Dot, Matte Finish, Black, SIG-LOC Footprint, Enclosed Emitter SORX1500 The SIG-LOC (Leverage Optimized Connection) system was conceived 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 the next era of expectations 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 zero shift caused by extensive recoil and harsh impacts. The unique bottom-mounted design allows for a longer focal length, dramatically reducing 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. Pistol slides configured with SIG-LOC mounting footprints remain fully compatible with traditional top-mount reflex sights.