Sig Sauer ROMEO-RS Compact Clear 1x Red Dot - Red Circle 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. Threaded 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 strength for the windage and elevation adjustment mechanisms. The ROMEO-RS features a convenient side-mounted illumination adjustment button protected by a raised steel housing that prevents 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 SIG-LOC 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. Made in the USA ; 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; MOTAC (Motion Activated Illumination) that powers up when motion is detected, powering down when inactive; Fully Backed by SIG SAUER's Infinite Guarantee;