Sig Sauer Romeo-X Sig-Loc 1x Red Dot - 6 MOA Dot - Designed specifically for SIG-LOC Optic Ready P365 slides, this optic features the innovative SIG-LOC bottom-mount system, creating five distinct points of contact for superior stability and exceptional zero retention under demanding use. Constructed with a fully enclosed and sealed 7075 aluminum housing, the optic is built for durability and dependable performance in any environment. A convenient side-loading CR1632 battery allows for quick battery changes without removing the optic or losing zero, while MOTAC motion-activated illumination technology delivers up to 20,000 hours of runtime for extended reliability. Its ultra-low deck height enables an absolute co-witness with standard iron sights, providing a seamless sight picture and enhanced shooting confidence straight out of the box. Made in the USA ; 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;