Manufaturer Part Number: SOR02190The 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.Featuring a convenient side-mounted illumination adjustment button embedded into the polymer housing to prevent accidental interference; side-load battery tray; motac (motion activated illumination) that powers up when motion is detected, powering down when inactive; 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.Battery Size: CR1632Magnification: 1xObjective: 24mmDot Size: 6 MOALength: 1.61"Weight: 21.40 ozReticle: Green DotOptic Coating: SpectraCoat