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Check out this site below. Gives you the info you want in detail. https://freedomgorilla.com/collections/ruger-rxm-red-green-dot-sights?srsltid=AfmBOopzQ_jTMP83VjAVP4euJUwQL-UeHvZtwPxTu_W6TXDu17V-DACE

Hi Phil and welcome. The Holosun is a top rated and recommend Optic for the Ruger RXM 9mm: https://www.budsgunshop.com/product_info.php/products_id/137909/holosun+he507k-gr-x2+reflex+sight+multi+reticle ------------ cheers, stay safe and enjoy!