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Nope the Range Officer is built on their regular .45ACP platform and sized for the 23mm case, the EMP is sized for the 19mm case. The RO's magazine won't even fit into the frame of the EMP. They designed the EMP around the 9x19mm round to make it both smaller and more reliable

This EMP magazine claims to work but others stated it didn't -- https://www.budsgunshop.com/catalog/product_info.php/products_id/43526 Here are 2 other extra magazines that 100% work --- https://www.budsgunshop.com/catalog/product_info.php/products_id/27377 ------------------------- https://www.budsgunshop.com/catalog/product_info.php/products_id/27536

The EMP mags will not work but these work very well in my 1911 9mm https://www.budsgunshop.com/catalog/product_info.php/cPath/26_27/products_id/711009565/Magazine+for+1911+9mm+9+Round+Nickel