SIG-LOC (Leveraged Optimized Connection) features a new proprietary bottom-mount technology that has multiple interface features between the pistol slide and the optic that provides for an extremely strong and robust lock-up. This new mounting system, when combined with the side-mounted battery on the ROMEO-M17, allows the optic to have an extremely low position when mounted to the slide, giving the user a full sight picture and co-witness with the existing standard-height iron sights. This footprint can be found on the M17/M18 MHS + Commemorative line of pistols.