Sig Sauer Romeo-RS Pro 1x Red Dot - 6 MOA Dot - The ROMEO-RS (Reinforced Steel) was specifically engineered to provide the accuracy and convenience of a pistol-mounted red dot at a cost that competes with high-end iron sights. Inspired by the design of modern striker-fired pistols that employ high-strength polymer and metal, the ROMEO-RS housing forms around a rugged steel chassis that supports and protects a premium aspherical glass lens. Metal inserts allow for optimal torque load when mounting the optic to a pistol slide and installing the side-load battery tray, while additional metal inserts provide increased accuracy and long term durability for the windage and elevation adjustment mechanisms. The ROMEO-RS features a convenient side-mounted illumination adjustment button embedded into the polymer housing to prevent accidental interference, and the side-load battery tray makes battery replacements easy to do while maintaining zero. SIG SAUER's updated footprint design maintains true compatibility with industry-standard optics cuts while allowing for the additional lock-up strength provided by steel recoil pins to eliminate the potential for any lateral shift. Built in Tualatin, Oregon, the ROMEO-RS was engineered to deliver premium red dot functionality at a cost that's within reach of any shooter. FEATURES: Hybrid design featuring a skeletonized steel chassis, molded into a high-strength polymer housing; Molded glass aspheric lens for a distortion-free sight picture; High efficiency point source LED emitter with 8 individual brightness settings; Large side control button for easy reticle adjustments; Convenient side-mounted CR1632 battery tray with security screw for easy access without removing the optic from the firearm; Minimum continuous runtime of 20,000 hours (at medium setting, dot-only); MOTAC (Motion Activated Illumination) that powers up when motion is detected, powering down when inactive; Designed, developed, tested and assembled in the USA; Fully Backed by SIG SAUER's Infinite Guarantee; ROMEO-RS PRO is suited for the optic ready P320, P226 & P229 Family of pistols with the PRO cut slide (not compatible with the original ROMEO1 cut pistols) ;