The M17 and M18 pistols have been selected by the US Military as the official sidearm, and the Sig Sauer ROMEO-M17 is the only optic that is truly designed specifically for this pistol. All other optics have many disadvantages and make several compromises. The ROMEO-M17 does not. This is an American-built MIL SPEC red dot truly worthy of the SIG SAUER name.FeaturesA fully enclosed, sealed, and purged optical system, for ultimate protection from the elementsMounts from underneath the pistol slide, re-using the MHS pistol rear sight block and sight block screw7075 Aluminum housingIntegrated gas deflector on the front of the housingMachined anti-reflection grooves on all rear surfaces for reduced glareExtremely low deck height, allowing a full sight picture and co-witness with standard-height sightsSIG-LOC (SIG Leverage Optimizing Connection) proprietary mounting interface, for the ultimate optic/pistol lockup.A high-efficiency point source LED emitter, with 2 MOA dot/32 MOA circle re...